Clean Grout With a Bleach Pen
For really mildewed grout, you may need a second application, and it can help to gently scrub the bleach into the grout with a toothbrush before allowing it to work for 10 minutes. Make sure to run the fan in the bathroom and to avoid skin contact. This method is best for light or white grout. If you have colored grout, test a small area first. It might fade.
Clean the Exhaust Fan
Caution: The cans contain chemical propellants, not just air. Don't let children play with them.
Bleach Away Stains
Remove stubborn stains from marble, cultured marble or plastic laminate with a bleach-soaked paper towel. Cover the towel with a cup to contain the bleach odor, and leave it in place overnight. If the stain has faded but not disappeared, just repeat the process. Test this trick in a hidden area first; it could discolor the surface. Dealing with a whole countertop? You can renew it yourself.