You can use white vinegar for effective rust removal. The rust reacts with the vinegar and later dissolves. Simply soak the rusty metal object in white vinegar for a couple of hours and then just wipe to remove the rust.

What dissolves rust fast?

Phosphoric acid will dissolve the iron oxide, which is the rust, more quickly than it will dissolve the iron or steel. It can be neutralized fairly easily with a baking soda paste — made by mixing baking soda and water — when the rust has been dissolved.

What chemicals kill rust?

The most commonly used rust removing chemical is phosphoric acid. The solution creates a chemical reaction when applied to rust converting it to a water-soluble compound that can be scrubbed away quickly and easily.