Rust spots on knives really drive me nuts. It makes them look dirty and gross. Luckily, I don’t have too many on my knives because I really try to hand wash them, but I had enough to give this removal method a try.
Soak your knives in lemon juice for a few minutes and then scrub them with a scrub brush or rough sponge.
Before:
After:
It worked! You can even see where the stains were because they look rubbed off. After I took this picture, I scrubbed the whole knife so those spots disappeared. The entire knife looked cleaner afterwards. Another success!
Source:
Embracing the Moment
Baking soda works well, also, but this way seems safer for your fingers
Also Comet works great on rust spots! I actually just tried it today!!! As well as some old spoons that were coffee stained!