How to clean stained grout in shower Tile whether or not it is used as ground, in the kitchen as a backsplash or for counters, or in the bathroom has one nice downfall: grout. Due to the fact grout is porous in nature, unsealed grout absorbs a wide variety of stains, from mold to espresso and everything in between. To say it is a headache to keep grout blank is an understatement. Note: Be cautious of using too much lemon juice with marble, on account that it may etch or damage the stone if left on too long.
Hydrogen peroxide could be a protected alternative. .