You can eliminate mold and hard water deposits on the grout in your tub and shower by spreading foam shaving cream on the grout lines after your next shower. Let this sit for about 10 minutes. Then, wash away with water. The steam from the shower will have loosened the grime thus making it easier for the foam’s alcohol to soak into the crevices and break down stains so you can just wipe with a damp cloth. Since shaving cream is bleach-free, it can be used on both dark and light grout.