So, your knife got left out damp, maybe in the sink, maybe just on the bench overnight. Now it’s got a bit of rust on the blade and you’re wondering if it’s wrecked.
Good news! It’s not. Carbon steel is super easy to maintain and fix. Here's why it rusts, and how to clean it up.

Why it rusts

Our knives are made from carbon steel. That’s what makes them sharp, easy to keep sharp, and enjoyable to use.

But carbon steel will rust if it stays wet for too long.
That’s just part of using a real carbon steel blade.

How to clean it

If your knife has rust on the blade, here’s what to do:

1. Wash it

Use warm water and a soft sponge to clean the blade. Dry it straight away.

2. Remove the rust

Pour dishwashing liquid on the rusty area.
Add a sprinkle of baking soda to make a paste.
Use an abrasive pad or scrubbing brush to rub the rust off.

For tougher rust, use a tiny bit of metal polish (like Bar Keepers Friend).
Go slow. Don’t scrub hard. Just light pressure in small circles.

3. Wipe it clean

Once the rust is gone, wipe the blade with a damp cloth and dry it completely.

4. Oil the blade

Finish by rubbing a small amount of food-safe oil (mineral oil) over the blade to protect it from moisture.

Carbon steel needs a bit of looking after, but it’s worth it. Bring your knife back to life, give it a bit of care now and then, and it’ll stick with you for years. If you’ve just cleaned up your blade, nice work! That’s how you do it.