The knife is the most important tool in the kitchen. But over time, they develop those pesky red rust stains, either from regular use, or maybe because it didn't dry completely after a previous wash. The best way to clean those is to leave the knife in a mug of vinegar for five minutes. You need to take proper care of your knife. If you leave it wet, it will get rust stains, which don't come off no matter how much you scrub. We previously suggested dipping it in lime juice, but oh boy, who's going to get a mug of lime juice?
Vinegar is easier to find in larger quantities. It is great for cleaning other things too, so buy a big bottle if you need to. Pour it out into a mug or a glass that is tall enough for the knife to be submerged. Rust stains are often closer to the handle, so measure the mug against the knife before you pour.
After leaving the knife for five minutes, take it out and clean it thoroughly. This time, the rust stains will come out when you scrub.
Quick Tips: Removing Rust Stains From Knives [One Pot Chef]