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0 of 5 steps completedStep-by-Step Instructions
1 Step 1: Identify type (surface vs structural)
Step 1: Identify type (surface vs structural)
Surface mold on grout/caulk = DIY. Mold inside walls or after major water leak = professional remediation.
Warning: Black mold inside walls or hidden behind drywall is a remediation job, not DIY. Symptoms include musty smell with no visible mold or recent flooding.
Surface only = DIY scrub
Visible mold on grout, caulk, walls.
Hidden mold or recent flooding = call remediation pro
Insurance may cover. Don't DIY structural mold.
2 Step 2: Use bleach OR vinegar (not both)
Step 2: Use bleach OR vinegar (not both)
Both kill surface mold. Bleach is faster but doesn't penetrate porous surfaces. Vinegar penetrates better.
White vinegar full strength (grout)
Penetrates porous grout better than bleach.
Bleach 1:10 with water (tile/glass)
Spray, wait 10 min, scrub, rinse. Wear gloves.
Concrobium Mold Control (preventive)
Sprays on, dries to invisible mold barrier. ~$15.
3 Step 3: Replace moldy caulk + grout
Step 3: Replace moldy caulk + grout
If caulk is black through the entire bead, just replace it. Wider grout often has surface mold but is salvageable with thorough scrubbing.
Strip + recaulk if mold is deep
See /how-to-caulk-a-bathtub-or-shower.
Grout brush + bleach paste
Old toothbrush works. Concentrated cleaning.
4 Step 4: Fix the humidity (this is the real solution)
Step 4: Fix the humidity (this is the real solution)
Run exhaust fan 30 minutes after every shower. Without ventilation, mold WILL return regardless of cleaning.
Run exhaust fan 30+ min after shower
Timer switch makes it automatic. ~$25.
Dehumidifier in problem rooms
Mid-size dehumidifier reduces room humidity below 60%. ~$200.
5 Step 5: Wipe shower walls after each use
Step 5: Wipe shower walls after each use
Water = mold food. Squeegee or wipe walls after every shower. The 30-second habit.
Squeegee after every shower
Same as hard water prevention.
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