How to remove rust from tools: scrub, soak, dry and protect

Step by step: how to remove rust from tools

Safety first. Wear safety glasses when wire brushing, since bristles and rust flakes fly. Use acids and rust removers with gloves in a ventilated space, never mix vinegar or rust removers with bleach, and keep hands clear of blades and pruner jaws while you scrub.

1. 1

   Clean off dirt and grease first

   Wash the tools in warm, soapy water or wipe them with a degreaser to remove soil, sap and oil. Rust removers and vinegar work on rust, not on grease, so a greasy tool soaks unevenly. Dry them before the next step.

2. 2

   Brush off loose rust

   Scrub the rusty areas with a wire brush or medium steel wool, working with the grain of the metal. Flaky, orange rust should come away as powder. Stop when you hit firm rust or bare metal; the soak handles what is left.

3. 3

   Take apart what you can

   Remove wooden handles, plastic grips and springs when they come off easily, and open pliers and pruners fully. Acids can damage wood, paint and some plastics, and taking tools apart lets the soak reach rust in the joints.

4. 4

   Soak the rusty steel

   Submerge the rusty parts in undiluted white vinegar or a rust remover in a plastic tub. Check light rust after an hour; heavy rust may need overnight, up to about 24 hours in vinegar. Do not leave tools in vinegar for days, because the acid keeps eating at the steel once the rust is gone.

5. 5

   Scrub away the softened rust

   Lift the tools out and scrub with a brass brush, steel wool or an abrasive pad. The rust should now wipe off as a dark sludge, leaving gray metal. Soak again for another hour or two on any spots that will not budge.

6. 6

   Neutralize and rinse

   After vinegar, swish the tools in a gallon of water with about 1/4 cup of baking soda to neutralize the acid, then rinse in clean water. After a water-based rust remover, rinse or wipe as its label directs. Pitted steel will stay pitted; cleaning removes rust, not the metal it ate.

7. 7

   Dry the tools immediately

   Towel them dry, then leave them in the sun or blow warm air over them so moisture leaves the joints and pits. Bare steel straight out of an acid bath can flash rust within an hour if left wet. A light orange haze means it needs a quick wipe with steel wool and faster drying.

8. 8

   Oil, sharpen and reassemble

   Wipe a thin coat of light machine oil or rust-preventive spray over all bare steel and work a drop into hinges and pivots. Sharpen blades now if they need it, then put handles and grips back on. Store the tools somewhere dry.

Which rust removal method should you use?

Match the method to how much rust there is. Light surface rust comes off by hand; heavy, crusted rust needs a soak first.

Evapo-Rust markets its remover as a no-scrub, reusable soak that takes rust off tools and hardware down to bare metal, and also sells a water-based rust inhibitor. CLR Calcium, Lime & Rust Remover is labeled for surface rust on household surfaces: mix it 1 to 1 with warm water, leave it no longer than 2 minutes, and never mix it with bleach or other cleaners. That makes it a quick wipe for rust stains, not an overnight tool bath.

Why tools rust, and how to keep rust from coming back

Tools rust because bare steel meets moisture and air; damp storage and salt speed it up. The Canadian Conservation Institute’s note on caring for iron explains that rusting is slow in clean, dry air, faster in humid air, and faster still when a thin film of water sits on the metal. Water-soluble salts, from road salt, sweat or soil, make it worse.

• Wipe tools dry after each use and knock off soil before it holds moisture against the steel.
• Keep a thin coat of oil on blades and bare metal, renewed every few months and after washing.
• Store tools off a damp floor, in a dry shed or garage, and not in a closed plastic bin where condensation collects.
• For garden tools, some people keep a bucket of sand mixed with a little oil to push shovel and trowel blades into after use.

When to restore a rusty tool and when to replace it

Restore it if the steel is sound under the rust; replace it if rust has eaten through or weakened a part that takes load. Deep pitting on a striking face, a cracked hammer head, or rust that has thinned a wrench jaw, ladder hook or pruner spring is a safety risk, because the part can snap under force.

Antique or collectible tools are different. Stripping them to bright metal can lower their value, and conservators suggest leaving a stable, even layer of dark rust in place. For rust on cookware or household surfaces, see our guides to removing rust from cast iron and removing rust from metal.

Mistakes to avoid

• Leaving tools in vinegar for days, which pits the steel after the rust is gone.
• Letting freshly cleaned steel air dry slowly, so it flash rusts overnight.
• Soaking wooden handles in vinegar or rust remover, which swells and stains the wood.
• Skipping the oil coat, so the rust returns within weeks.
• Wire brushing without safety glasses.
• Mixing vinegar or an acid rust remover with bleach.