Cleaning garden tools rarely makes anyone’s weekend highlight reel, but dirty pruning shears do real damage. Gunked-up blades crush stems instead of slicing them, and worse, they carry plant disease from one cut to the next.
This guide walks through a full deep clean, rust removal, disinfecting, and sharpening. None of it is hard, and it beats replacing a seized-up pair every spring.
Key Takeaways
- Deep clean: Disassemble the shears, soak the metal parts in white vinegar to dissolve rust, then scrub with steel wool.
- Disinfect: Wipe blades with 70% isopropyl alcohol between cuts to stop spreading plant disease, and save the 10% bleach soak for fire blight, rinsing and oiling the steel afterward.
- Sharpen: File only the beveled side of a bypass blade at its factory angle (roughly 20 to 25 degrees), then remove the burr.
- Maintain: Wipe off sap after every use, oil the pivot, and store the shears somewhere dry.
How to Clean Pruning Shears
There are several ways to tackle dirty pruning shears, but a proper deep clean needs a little disassembly. This method strips sap, rust, and soil.
- Disassemble the shears: Unscrew the nut holding the blades together. Lay the pieces on a towel in order so you do not lose a spring or a screw. This lets you reach the grime hiding in the pivot.
- Soak to remove rust: Submerge the metal parts in distilled white vinegar for 12 to 24 hours. The acetic acid eats away corrosion without harming the steel.
- Scrub the blades: Lift the parts out of the vinegar and buff off the loosened rust with fine steel wool or a wire brush. For stubborn dried sap, a little mineral spirits or rubbing alcohol breaks it down.
- Wash with soap: Scrub the parts with warm water and dish soap to clear any vinegar residue and leftover dirt.
- Dry immediately: Moisture is the enemy. Dry every piece thoroughly with a clean cloth.
- Reassemble: Put the shears back together and tighten the nut until the blades move smoothly without wobbling.
How to Sterilize Pruning Shears
Cleaning removes dirt, but disinfecting is what stops your shears from carrying plant disease. Pathogens like fire blight, cankers, and viruses ride from one plant to the next on the blade, so disinfect between plants at a minimum when you cut diseased material, and between every cut when you work directly on an infected plant. Fire blight is a clear example, since it spreads on rain, wind, and dirty pruning tools.
- Choose your disinfectant: For everyday work, 70% (or stronger) isopropyl alcohol (1) is the simplest pick. You wipe or dip the blade with no soaking and no rinsing, and it is far gentler on steel than bleach. For bacterial diseases like fire blight on apples and pears, a 10% bleach solution (one part bleach to nine parts water) works better than alcohol, according to Iowa State University Extension.
- Wipe or soak: With alcohol, wipe the blades or dip them for a few seconds between cuts. With bleach, soak the blades for about 10 minutes, and mix a fresh batch every couple of hours since the solution weakens fast.
- Rinse and oil after bleach: Bleach pits and corrodes steel, so never leave tools sitting in it. Rinse the blades with clean water, dry them, then rub on a few drops of mineral or machine oil to protect the edge. Alcohol evaporates on its own and needs no rinse.
- Dry before storing: Make sure the tool is bone dry before it goes back on the shelf.
Don't Forget
If you wiped down diseased tools with a towel, that towel is now contaminated. Wash it in hot water with a strong laundry detergent before you use it again.
How to Sharpen Garden Shears
If your garden shears mash stems instead of snipping them, they are too dull. Sharpening looks intimidating, but it is straightforward once you know which edge to touch.
- Identify the bevel: Look at the blade. Most bypass pruners are beveled (angled) on one side only. You sharpen the angled side, never the flat side.
- Position the file: Hold the shears firmly. Set a diamond file or whetstone against the beveled edge at the same angle as the factory grind (usually around 20 to 25 degrees (2), but match whatever your pruner came with).
- File in one direction: Apply moderate pressure and push the file across the blade away from your body. Lift it, return to the start, and repeat. Do not saw back and forth.
- Remove the burr: Once the edge looks shiny and sharp, run the file flat against the back (flat) side of the blade just once. That knocks off the “burr,” the thin wire edge sharpening leaves behind.
When In Doubt
If you own expensive shears and feel nervous about ruining the angle, take them to a local hardware store or garden center. Many sharpen tools for a small fee.
How to Maintain Pruning Shears
A little upkeep keeps your tools running for years. Treat your shears well, and you will not spend an afternoon scrubbing rust later.
- Sharpen regularly: Touch up the blade with a few passes of a file every couple of weeks during the growing season. It takes seconds and keeps every cut clean.
- Lubricate the pivot: Put a few drops of lubricating oil (3-in-One or mineral oil) on the pivot and spring, then open and close the shears to work it in. WD-40 is fine for cleaning, but a real lubricating oil holds up better for long-term smooth action.
- Wipe after every use: Keep a rag in your pocket while you garden and wipe off sap and moisture before you head inside.
- Store them dry: Never leave tools out in the rain or in a damp shed corner. A dry toolbox, or a bucket of sand mixed with a little oil, is a good home for metal tools.
- Clean after chemical use: If you prune plants treated with pesticides or fertilizers, wash the blades right away. Those chemicals react with metal and speed up corrosion.
