White canvas shoes are perfect for summer – until they start looking beige. Here’s how to remove stains, thanks to How to Clean Stuff. Scrub away dirt stains with shampoo on a nail brush, wipe residue away with a damp sponge. Use dish soap on grass stains, and nail polish remover on grease or tar. After you’ve removed as much as possible, apply oxygen bleach with a nailbrush or toothbrush to any remaining off-white areas. If you don’t mind losing the new look, canvas shoes can usually be machine washed on a gentle cycle with warm water. Hang to air dry.