: I am renting a 1920s house with tubs and sinks that have bad rust stains. Waat can I use to get them white?Try some lemon juice first it can do wonders because it acidic even tomato juice,even vinegar they may be slow have to sit awhile but theyre safe.WARNING WARNING WARNING!!!!! These can cause harm if not used as directed!! wear eye and skin protection.When you put them on flush off with water quickly or they will etch whats left of the surface finnish.1-a weak solution of muratic acid. 2- toilet bowl cleaners