Deep-Clean Your Bathroom in 7 Steps
What to do: Dip a grout brush in straight bleach and scrub any discolored areas; rinse well. Be sure to ventilate the room.
Why: Grout is porous and highly susceptible to bacteria growth.
Best practice: Seal grout every six months to help prevent moisture and grime from infiltrating (try DuPont Advanced Grout Sealer; $15, lowes.com).