Because grout is porous, germs and mold love to live in it. Dip a grout brush in bleach or a tile and grout cleaner and scrub any discolored areas. Don't forget to seal grout every six months to help ...
"Sprinkle into the rubber seal some bicarbonate of soda, spritz with water, scrub with a small brush, leave for 10 minutes, and then run a rinse cycle. "The bicarb will soak up the odours and clean up ...