How To: Clean Grout
What You Need
Follow These Four Easy Steps
Wearing rubber gloves, spray the grout area well with mildew remover. (Be sure to use a cleaner specially formulated to tackle mildew: Ordinary cleaners won't make a dent in mildew or mold, and the ammonia in them may yellow the grout.)
Using a grout brush or an old toothbrush, scrub tile in direction of the grout. Once you’re done, let the treatment sit for 15 minutes.
Rinse the entire surface clean with water and a sponge.
Tip: Keep the brush handy while rinsing so you can scrub stubborn spots.
Let the tile dry, and then give grout a final light misting with mildew remover to protect against future staining.
Tip: You can prevent mold buildup by running a squeegee over tile after a shower. The same trick will eliminate soap buildup on glass shower doors.