How to Get Rid of Mold in the Shower: What the EPA, CDC and Caulk Makers Actually Say
AI-generated image: mold along the caulk line where a tub meets tile. THE SHORT ANSWER For a small patch on tile or grout, fix the moisture, scrub with detergent and water, and dry it completely . That is the EPA’s core advice. Bleach is optional, not required, and mold that has grown into or under caulk usually means the caulk has to be replaced. ✓ Under about 10 square feet (roughly 3 by 3 feet), EPA and CDC both say most people can clean it themselves. ✓ If you use bleach, CDC says no more than 1 cup per gallon of water , with the room ventilated. ✓ Mold comes back unless the room dries: run the fan during the shower and for about 20 minutes after. How this guide was made: I compared mold guidance from the U.S. EPA and CDC, a public-health guide from NEHA, ventilation guidance attributed to the Home Ventilating Institute, and caulk advice from sealant makers and home-repair sources. I have not tested these methods myself. Last checked: November 2026. ORIGINAL FINDINGS What we f...