How to Clean Drywall Tools | Scrape, Soak, Scrub, Dry

For the full breakdown, see our best Drywall Tool Belt guide.

Drywall tools take a beating on every job. Joint compound dries into a cement-like crust that ruins edges, clogs mechanisms, and invites rust if you let it sit overnight. The method that keeps hand tools working for years is simple: scrape, soak, scrub, rinse, dry. Hit each step in sequence, and your knives, trowels, and hawks stay in near-new condition. For a complete setup that keeps everything within reach on the job, a well-organized drywall tool belt makes the difference between hunting for gear and getting the work done.

The Cleanup Order That Prevents Rust

The order matters more than most people think. Joint compound bonds to metal quickly, so the sooner you start, the easier the job. For drywall hand tools, LEVEL5 Tools recommends wiping off excess residue, then soaking knives in warm water for a few minutes or using a damp cloth, followed by thorough drying between uses.

Work through these five steps after every session:

• Scrape: pull a putty knife or scraper across the blade to remove the bulk of wet compound before it hardens.
• Soak: let tools sit in warm water for a few minutes to soften anything you missed.
• Scrub: use a dish scouring pad — never steel wool, which scratches blade surfaces and leaves grit behind.
• Rinse: run clean water over every surface until no residue remains.
• Dry: wipe with a clean cloth, then stand tools upright so water drains away from the handle.

LEVEL5 specifically recommends placing knives upright while they dry so water does not collect near the handle, where it seeps into the joint and corrodes the tang.

Handling Corrosion on Finishing Tools

Even with careful drying, stainless-steel finishing tools occasionally develop superficial rust spots. When that happens, LEVEL5 Tools advises wiping the corrosion off or lightly sanding it with 220-grit or finer sandpaper. The key caution: work gently so you do not groove the blade edge, which compromises the smooth finish it leaves on mud.

For long-term storage, apply a light coating of WD-40 or a similar rust-inhibiting product to the blades before putting tools away. This thin film blocks moisture from reaching the metal during weeks or months between jobs. Before the next use, wipe the blade down so the lubricant does not contaminate your compound.

Cleaning Power Drywall Sanders Safely

Powered drywall sanders need different treatment than hand tools. Before any cleaning, unplug the unit — water and electricity do not mix, and the motor housing stays sealed. LEVEL5’s guidance for powered sanders calls for wearing a face or dust mask and ANSI Z87.1 eye protection, then cleaning with a damp cloth and soft soap.

Avoid solvents entirely, since they can degrade seals and plastic housings. Keep water out of the unit itself; the damp cloth handles surface dust without risking the motor. Dry the tool completely before storing it, and check the dust collection port for clogs that reduce suction on the next job.

Disposal Rules for Wash Water

What you rinse down the drain matters more than most homeowners realize. Drywall joint compound contains gypsum and binders that settle and harden inside plumbing, and some municipalities restrict disposing of it into drains. Check local rules before washing tools over a sink. Never dump drywall wash water into sewer or storm drains — the sediment can clog pipes and contaminate local water systems.

The safer approach for large jobs: wipe excess compound into a trash bag before rinsing, then wash tools over a bucket. Let the bucket sit so solids settle, pour the clear water off, and toss the remaining sludge with your construction waste. This keeps your plumbing clear and your disposal legal.

FAQs

Can I Leave Drywall Tools in Water Overnight?

Leaving drywall tools submerged overnight softens the compound but risks rust and handle damage. Wooden or rubber handles swell and crack when soaked for hours, and even stainless blades can pit with prolonged exposure. For stuck-on compound, a 10-to-15-minute soak in warm water loosens most residue without damaging the tool.

How Often Should I Oil My Drywall Knives?

Oil drywall knives before long-term storage rather than between every use. A light WD-40 coating protects blades that sit for weeks, but it can contaminate fresh joint compound if applied right before a job. Wipe blades clean before each use and reapply oil only when tools will not be used soon.

What Ruins Drywall Tools the Fastest?

Leaving joint compound to dry on the blade ruins drywall tools fastest. Once compound hardens, removing it requires aggressive scraping that dulls edges and scratches surfaces. Rust follows quickly when moisture sits against metal. Cleaning tools immediately after use prevents both problems and extends tool life significantly.