How do you remove iron stains from grout?
How do you remove iron stains from grout? Dish detergent works wonders in removing rust stains from grout. In a spray bottle, mix a solution of 1 cup water with 20 drops liquid dish detergent (any brand will do). Spray the solution onto the grout, let sit for a few minutes, then use a soft brush or sponge to rub away any leftover rust.