Dirty grout lines ruin the look of an entire room. Whether it is mold in the shower or grease on the kitchen backsplash, that grime is stubborn. Grout is porous, meaning it absorbs spills and bacteria like a sponge.
If you ignore it, the discoloration becomes permanent. Worse, unsealed grout can harbor mold that impacts your home’s air quality. You need a solution that penetrates deep to lift stains without damaging your tile.
We tested the top formulas on the market to find out which ones actually work. Here are the seven best grout cleaners to restore your floors and walls.
- Brightens grout lines and tiles
- Doesn’t require rough scrubbing
- Safe for colored grout
- Multiple purposes including grout and stovetops
- Non-abrasive formula
- Fast-working in less than a minute
- Kills and prevents mold and mildew
- Works on multiple surfaces
- Easy application squirt top
- Two-in-one cleaner
- A little goes a long way
- Angled brush included
- Quick and precise
- Usable on grout and garments
- Compact design fits in your pocket
- Seals and protectsgrout
- Restores and rejuvenates old-looking tiles
- Wide range of colors available
- Safe for the environment
- All-purpose cleaner
- EPA-certified and biodegradable
How to Choose a Grout Cleaner
Not all cleaners work on every type of tile. You need to pick the right tool for your specific mess. Here are the key factors to consider before buying.
Application Method
Grout cleaners come in different forms. Your choice depends on the size of the job and your physical comfort level.
- Spray bottles: These are best for vertical surfaces like shower walls. The nozzle allows you to target specific lines without wasting product.
- Squeeze gels: Gel formulas cling to the grout. They are excellent for letting the solution sit and penetrate deep stains without dripping away.
- Liquid concentrates: You mix these with water in a bucket. This is the most economical choice for cleaning large floor areas.
- Pens: These are for precision touch-ups. They usually contain bleach or paint to cover small, stubborn spots.
Consider the dwell time, too. Some heavy-duty acid cleaners work instantly, while enzymatic cleaners need to sit for several minutes to break down biological matter.
Ingredients and Safety
Grout cleaners rely on chemical reactions to lift dirt. This means they can be hazardous if handled incorrectly.
- Acidic vs. Alkaline: Acidic cleaners (low pH) are great for removing haze and mineral deposits but can damage natural stone like marble or limestone. Alkaline cleaners (high pH) are better for cutting through grease in kitchens.
- Protective gear: Always wear rubber gloves and eye protection. Fumes can be strong, so ensure the room is well-ventilated.
- Pet safety: If you have pets, look for neutral pH cleaners or rinse the floor thoroughly to prevent paw irritation.
Storage Tip
How to Clean Grout Effectively
Scrubbing grout requires technique. The goal is to agitate the dirt without scratching the surrounding tile. Whether you are tackling a bathroom floor or a kitchen backsplash, follow these steps.
Use a dedicated grout brush. These brushes have stiff, narrow bristles designed to fit into tight grout lines. A toothbrush is too soft, and a large scrubbing brush is too wide to be effective.
Maintenance Frequency
You should deep clean grout lines whenever they look dingy or discolored. For most homes, this means once a month. However, high-traffic areas or damp zones like showers may need attention every two weeks to prevent mold growth.
Regular maintenance prevents dirt from getting ground into the pores of the grout, which makes deep cleaning much easier in the long run.
Common Mistakes to Avoid
Protect your investment by avoiding these common cleaning errors:
1. Using Vinegar on Unsealed Grout
Vinegar is a popular DIY cleaner, but it is acidic. Over time, acid eats away at the cement in the grout, causing it to crumble. The Tile Council of North America recommends using alkaline cleaners for general maintenance (1). Save the heavy acids for restoration jobs only.
2. Using Oil-Based Soaps
Avoid oil soaps or wax-based cleaners on tiled floors. Grout is porous. It absorbs these oils, which leave a sticky residue that actually attracts more dirt. This creates a cycle where the floor looks dirty faster.
3. Forgetting to Reseal
Grout sealant wears off over time. You should reseal your grout lines once a year. A good sealer creates a barrier that stops water and oil from penetrating the cement (2). Many modern cleaners also contain sealing agents to help maintain this barrier.
Product Reviews
We researched the most effective formulas to help you tackle grime. Here are our top seven picks.
Grout Cleaner and Brightener by ZEP
Best Brightener Grout Cleaner
ZEP is a powerhouse when you need to restore old, neglected floors. This acidic formula is specifically designed to brighten light-colored grout lines that have turned gray or black over time.
It works by using strong acids to dissolve the top layer of grime and mineral deposits. You apply it, let it bubble for a few minutes, and then agitate it with a brush. The difference is often instant. The squirt top allows for precise application, so you do not waste product on the tile face.
However, power comes with risk. This is a heavy-duty chemical. It is not suitable for natural stone like marble, granite, or terrazzo, as the acid will etch the surface. You also need to be careful around chrome fixtures.
Pros
- Restorative power: It physically brightens grout lines, making floors look brand new.
- Less scrubbing: The chemical reaction does most of the heavy lifting for you.
- Precise nozzle: The squirt cap targets the grout line directly.
- Fast acting: You see results in minutes without long dwell times.
Cons
- Harsh fumes: You must use this in a well-ventilated area.
- Not for stone: It will damage marble, limestone, and other natural stones.
Product Specs
| Recommended Use | Tiles, grout |
| Form | Liquid |
| Container Type | Pour bottle |
| Brand | ZEP Professional |
| Kills Mold | No |
Our Ratings
Soft Scrub Gel Cleanser
Best Grout Cleaner for Multiple Surfaces
Soft Scrub with Bleach is a versatile gel that tackles tough stains on both horizontal and vertical surfaces. Because it is a thick gel, it clings to shower walls rather than running straight down the drain.
The bleach component kills mold and mildew spores while whitening the grout. It is non-abrasive, so it cleans without scratching your glossy tiles. Beyond grout, you can use this on sinks, toilets, and stovetops, making it a great all-in-one cleaner for under the sink.
Application is simple. Squeeze it onto the grout, let it sit for a minute to penetrate the stain, and then rinse. For deep discoloration, a quick scrub helps. Just be mindful of your clothes; the bleach will cause spotting if it splashes.
Pros
- Clings to walls: The thick gel formula stays put on vertical surfaces.
- Kills mold: Contains bleach to eliminate fungus and spores.
- Versatile: Safe for use on ceramic tile, sinks, countertops, and toilets.
- Non-abrasive: Cleans effectively without scratching delicate surfaces.
Cons
- Bleach odor: It has a strong chemical smell that requires ventilation.
- Rinsing required: The thick gel takes a bit of extra water to rinse away completely.
Product Specs
| Recommended Use | Tiles, grout, kitchen countertops, stovetops |
| Form | Gel |
| Container Type | Squeeze bottle |
| Brand | Soft Scrub |
| Kills Mold | Yes |
Our Ratings
Mold Armor Professional Brand
Best Against Mold Grout Cleaner
If your primary issue is black mold spots in your shower, Mold Armor is the solution. This instant mold and mildew remover is designed to kill fungi on contact without the need for heavy scrubbing.
The spray bottle makes it easy to coat large areas of tiled walls quickly. It uses a bleach-based formula to dissolve the mold and whiten the stain underneath. You simply spray it on, wait for the stain to disappear, and rinse it off.
It is incredibly effective, but it is also potent. The fumes are strong, so open a window and turn on the bathroom fan. It works on grout, fiberglass, vinyl, and even concrete, making it a versatile tool for damp areas.
Pros
- No scrub: Dissolves mold and mildew stains on contact.
- Fast results: Visible improvement often happens in seconds.
- Versatile: Works on tile, grout, toilets, and shower curtains.
- Preventative: Helps inhibit new mold growth after cleaning.
Cons
- Very strong fumes: Can be overwhelming in small, enclosed bathrooms.
- Bleach content: Will bleach towels or bathmats if dripped.
Product Specs
| Recommended Use | Tiles, grout, stainless steel, plastic surfaces |
| Form | Liquid |
| Container Type | Spray bottle |
| Brand | Mold Armor |
| Kills Mold | Yes |
Our Ratings
The Floor Guys Grout-EEZ
Best Grout Cleaner with Brush
Grout-EEZ is a heavy-duty alkaline cleaner designed for professional-style results at home. It comes as a complete kit, including the cleaning solution and a stiff-bristled brush that attaches to any standard broom handle.
This “stand-up” cleaning method saves your knees and back. You pour the liquid into the grout lines, let it sit for about 10 minutes to loosen the grease and dirt, and then scrub with the long-handled brush.
It is safe for porcelain and ceramic tiles but acts as a stripper. This means it will remove old sealers, so you must reseal your grout after using this product. It is an excellent choice for a deep, annual restoration clean.
Pros
- Includes brush: Comes with a specialized grout brush for deep agitation.
- Back-saving: The brush attaches to a pole, so you clean while standing.
- Deep cleaning: Heavy-duty formula penetrates years of grime.
- 2-in-1 action: Cleans dirt and strips old sealer in one step.
Cons
- Strips sealer: You must reseal the grout after use to prevent future stains.
- Not for stone: Avoid using on natural stone surfaces.
Product Specs
| Recommended Use | Kitchen and bathroom grout |
| Form | Liquid |
| Container Type | Bottle |
| Brand | The Floor Guys |
| Kills Mold | Not specified |
Our Ratings
Zero Splash Bleach Pen by Clorox
Best Quick-Fix Grout Cleaner
Sometimes you do not need to clean the whole floor; you just need to fix a few stubborn spots. The Clorox Bleach Pen is the perfect tool for precision cleaning. It allows you to target a specific stain without getting bleach on the surrounding pattern or colored tile.
The pen features a dual-tip design. One end has a fine point for tight corners, and the other has a broad scrubber for wider grout lines. The gel formula stays exactly where you put it.
This is ideal for quick touch-ups before guests arrive or for tackling that one annoying spot of mildew in the shower corner. It fits easily in a cleaning caddy or drawer.
Pros
- Precision control: Target stains without affecting surrounding areas.
- Dual tips: Fine point and scrub brush options for different messes.
- No splash: Gel formula eliminates the risk of bleach splatters.
- Portable: Small size makes it easy to store and use anywhere.
Cons
- Small volume: Not practical for cleaning an entire room.
- Hard to gauge: Opaque tube makes it difficult to see how much gel is left.
Product Specs
| Recommended Use | Tiles, grout, household areas, garments |
| Form | Liquid |
| Container Type | Pen |
| Brand | Clorox |
| Kills Mold | Not specified |
Our Ratings
Mapei Grout Refresh
Best Cleaner for Colored Grout
When cleaning isn’t enough, you might need to recolor. Mapei Grout Refresh is essentially a paint and sealer in one. If your grout is permanently stained or you simply hate the color, this product lets you change it without regrouting.
It comes in a variety of colors to match or contrast with your tile. You apply a thin bead to the grout line and scrub it in with a toothbrush. Once it dries, you wipe away the excess from the tile face.
This product seals the grout as it colors, making it resistant to future stains and mold. It takes time and patience to apply, but the results look like a brand-new installation.
Pros
- Total transformation: Changes the color of the grout completely.
- Built-in sealer: Protects against future stains and moisture.
- Variety: Available in many colors to match any decor.
- Cost-effective: Much cheaper than re-grouting the entire floor.
Cons
- Labor intensive: Applying it to every line takes time and steady hands.
- Long drying time: Requires 24 hours to cure fully.
Product Specs
| Recommended Use | Ceramic and porcelain tiles |
| Form | Liquid |
| Container Type | Bottle |
| Brand | Mapei |
| Kills Mold | No |
Our Ratings
CLR Brilliant Bath
Best Grout Cleaner with Biodegradable Formula
CLR Brilliant Bath is the best choice for those who want effective cleaning without harsh industrial chemicals. This foaming spray is EPA Safer Choice certified, meaning it is safer for families, pets, and the environment.
It excels at removing hard water deposits, calcium, and soap scum that often cloud grout lines. The foam expands to lift dirt from the porous surface. It contains no bleach, ammonia, or phosphates, so it doesn’t have that eye-watering chemical smell.
You can use it freely on glass shower doors, stainless steel fixtures, and white grout. While it isn’t a mold killer, it is excellent for general maintenance and removing mineral buildup.
Pros
- Eco-friendly: Biodegradable and EPA Safer Choice certified.
- Multi-surface: Safe for glass, stainless steel, and ceramic.
- Foaming action: Clings to dirt to lift it away effectively.
- Pleasant scent: No harsh bleach or ammonia odors.
Cons
- Not a mold killer: It removes dirt but does not contain fungicides.
Product Specs
| Recommended Use | Kitchen and bathroom surfaces |
| Form | Liquid, foam |
| Container Type | Spray bottle |
| Brand | CLR |
| Kills Mold | No |
Our Ratings
| Product | Award | Recommended Use | Form | Bottle Type | Kills Mold |
| ZEP Brightener | Best Brightener | Tiles, grout | Liquid | Pour | No |
| Soft Scrub Gel | Best For Multiple Surfaces | Tiles, grout, kitchen countertops, stovetops | Gel | Squeeze | Yes |
| RMR Mold Killer | Best Against Mold | Tiles, grout, stainless steel, plastic surfaces | Liquid | Spray | Yes |
| The Floor Guys | Best with Brush | Kitchen and bathroom grout | Liquid | Bottle | N/A |
| Clorox Zero | Best Quick-Fix | Tiles, grout, household areas, garments | Liquid | Pen | N/A |
| Mapei Refresh | Best For Colored Grout | Ceramic and porcelain tiles | Liquid | Bottle | No |
| CLR Cleaner | Best Biodegradable | Kitchen and bathroom surfaces | Liquid, foam | Spray | No |
FAQs
Why Does Bathroom Grout Turn Black?
Bathroom grout turns black primarily due to mold and mildew growth caused by excessive moisture. Soap scum can also trap dirt, creating a dark film. To fix this, use a mold-specific cleaner like RMR-86 to kill the spores.
How Do You Clean Grout Without Scrubbing?
To clean without scrubbing, use a spray-on product containing bleach or hydrogen peroxide. Products like Amazon Basics Hydrogen Peroxide break down organic stains chemically. Simply spray, let it dwell for 10 minutes, and rinse.
What Do Professionals Use to Clean Grout?
Professionals typically use high-pressure steam cleaners or industrial-strength alkaline solutions. Steam penetrates deep into the pores to blast out dirt without using harsh chemicals, while alkaline cleaners strip grease effectively.
Does Vinegar Ruin Grout?
Yes, vinegar can ruin grout over time. It is highly acidic and can dissolve the cement-based components of the grout, causing it to crack or crumble. It is safer to use a neutral pH cleaner or a diluted baking soda paste.
Does Toothpaste Clean Grout?
Toothpaste can clean small grout stains due to its mild abrasiveness and whitening agents. However, it is inefficient for large areas and ineffective against mold. A dedicated cleaner like Clorox bleach works much better.
Can I Use Bleach on Colored Grout?
You should be careful using bleach on colored grout. Long-term exposure to strong bleach can fade the pigments in the grout, leading to uneven discoloration. Stick to oxygen bleach or neutral cleaners for colored grout.
