Easy DIY · Bathroom moisture

Moldy Bathroom Caulk: Fix Moisture Before Resealing

Do not cover moldy caulk with a fresh bead. Address leaks and moisture, clean and dry the area, then decide whether a professional repair is needed.

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The EPA says not to paint or caulk over moldy surfaces: clean them, correct the moisture problem and dry completely first. Bathroom staining may indicate surface growth or hidden water intrusion.

Your try-it-at-home checklist

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Inspect caulk gaps around the bath, basin and shower, checking for standing water and discoloration. Do not pry into concealed joints.
Look for leaks, damp walls, swelling or recurring odors. Contact property management or a qualified professional for suspected hidden leaks or extensive damage.
For small accessible nonporous areas, gently clean with detergent and water suitable for the surface and dry thoroughly. Consider gloves and ventilation.
Never mix bleach with other cleaners or assume that spraying a chemical resolves contamination behind a joint.
Do not apply fresh caulk over visible mold. Hidden damage, repeated growth or a large affected area merits professional assessment.
Only after the moisture source has been fixed and surfaces are dry should a suitable repair be considered under product instructions. Wipe away water and ventilate after use.

Your try-it-at-home checklist

Further reading

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