Take some lemon juice and add enough salt to make a thick paste. Just wait. This is not a recipe for a lemonade or juice. It is the preparation of a homemade abrasive solution to clean rust from the various tools and other surfaces of the house. This lemon solution can be applied on the rust surface and tools and a slight scrub makes the surface clean. Rust removal from tools is always made using the sand paper. Now this is an easy method suggested in preventrust.info which is simpler and easier. There are more and more information on handling the rust problem.