Grubby grout lines can make even pricey tile look old and neglected. Scrubbing them by hand with harsh chemicals works, but it is slow going, and it leaves fumes and residue behind.
Learning how to steam clean grout gives you a chemical-free option that drives high-heat vapor into the pores and lifts the dirt back out. It sanitizes as it cleans, so your floors and walls come back without the hand-scrubbing. Here is how to do it safely, step by step.
Key Takeaways
- Steam cleaning is a chemical-free way to sanitize grout, and the Tile Council of North America lists it as an accepted cleaning method.
- Use a nylon brush attachment, never brass or steel bristles, which scratch tile and wear grout away.
- Vacuum and wipe the surface first so the steam lifts dirt out instead of pushing mud into the pores.
- Reseal the grout once it is fully dry to lock out new stains and make the next clean easier.
Can Steam Cleaning Damage Grout?
Steam cleaning is safe for most grout. The Tile Council of North America lists steaming as an effective cleaning method (1). There are a few situations where you should slow down and take care:
- Damaged grout: If your grout is cracked, crumbling, or poorly installed, the pressure of the steam can blow loose pieces out.
- Silicone caulk: Do not hold the steamer over silicone caulk (common in corners and around tubs) for long, since the heat can soften or distort it.
- Epoxy grout: Epoxy grout is more heat-sensitive than standard cement grout, so keep the steam moving and avoid parking the nozzle in one spot.
How Do You Steam Clean Grout?
You steam clean grout by driving high-heat vapor into the pores to loosen the dirt, then wiping it away before it can resettle. Grout is porous, so it soaks up grease, dirt, and limescale like a sponge, and wiping the tile alone often pushes the grime deeper into the lines.
That same heat is also one of the more reliable ways to kill bacteria without bleach (2).
Steam cleaners typically produce vapor between 200°F and 300°F, which helps kill bacteria; superheated steam removes up to 99.9% of common household bacteria and viruses on contact (3).
Here is the step-by-step process for bringing your tile back.
- Time: 30 to 60 minutes (depending on room size)
- Difficulty: Easy
What You’ll Need
Gather these supplies before you switch the machine on:
- Steam cleaner (canister or mop with attachments)
- Nylon brush attachment
- Distilled water
- Vacuum cleaner
- Microfiber cloths
- Old towel
- Grout sealant
1. Choose the Right Equipment
Not every steamer is up to the job. You want a machine that puts out concentrated, high-heat steam and takes the right attachments.
- Canister steam cleaners: Best for large floor areas. They hold more water and come with long hoses and precise nozzle attachments.
- Handheld steam cleaners: Ideal for backsplashes, shower walls, and small spot-cleaning jobs.
- The attachment: Make sure your unit has a nylon grout brush or a detail nozzle.
Avoid Metal Brushes
2. Clear the Room
Steam brings heat and humidity, so protect your belongings. Move furniture, rugs, and pet bowls out of the way.
If you are cleaning a kitchen backsplash, clear the counters of appliances and utensils. That removes tripping hazards and keeps you from accidentally steaming something delicate.
3. Pre-Clean the Surface
You cannot steam a floor that is covered in dust and hair. Skip this step and the steam turns that debris into hot mud, then drives it deeper into the grout.
- Vacuum thoroughly: Run a vacuum over the tiled floors to pick up loose debris, hair, and crumbs.
- Surface wipe: For sticky spills or heavy grime, give the floor a quick mop with water first. You want the steam focused on the grout, not surface stains.
4. Prepare the Steam Cleaner
Fill your steam cleaner’s tank. Use distilled water if you can. Tap water carries minerals that clog the machine over time and leave white deposits on dark tile.
Attach the nylon brush nozzle and turn the machine on. Let it heat up fully per the manufacturer’s instructions, which usually takes 5 to 10 minutes.
5. Steam and Scrub
Once the indicator shows the steam is ready, start cleaning.
- Start from the top: On walls, work from high to low. On floors, start at the farthest corner and work back toward the door.
- Apply steam directly: Hold the nozzle right over the grout line and release a burst of steam while you scrub gently with the brush attachment.
- Work in sections: Do not try to steam the whole room at once. Work in three-foot squares.
- Wipe immediately: This is the step that matters most. As soon as the dirt lifts, wipe it away with a microfiber cloth. Let it dry and the grime settles right back into the pores.
Safety First
6. Rinse the Floor
After you have steamed the whole area, the floor may look a little streaky from the loosened grime. Grab a clean mop and a bucket of plain water.
Rinse to remove any leftover residue, then let it dry completely. If any stubborn spots remain, hit them with the steamer again.
7. Seal the Grout
Deep cleaning opens the grout back up, which leaves it open to new stains. Always seal grout after a deep steam clean.
Wait until the grout is completely dry, which usually takes about 24 hours. Then apply a penetrating grout sealer. It lays a barrier over the surface that keeps dirt on top and makes the next cleaning far easier (6).
When to Hire a Professional
If you are short on time, or the grout is badly stained with mold or mildew that a home steamer cannot shift, it may be worth calling a pro.
Professional services run truck-mounted systems with higher pressure and heat than home units. They also use high-powered vacuum extraction to pull the dirty water up as they go (7).
FAQs
Keep Your Grout Looking New
Steam cleaning takes the ache out of floor care. It reaches deep into the pores where a mop cannot, and it leaves the room sanitized and looking fresh.
The trick to keeping that result is resealing the grout right after you clean it, then steaming again every 6 to 12 months before the dirt has a chance to build up. With a little upkeep and the right nozzle, you will not dread looking at your floors anymore.
