Household bleach (sodium hypochlorite)
Kills mold and whitens caulk
Cotton rope or cotton coil
Holds bleach against the caulk line
Gloves and eye protection
Safety first — bleach is harsh
Old towel or plastic sheet
Protects tub surface
✅ Note: Cotton coil is sold as “cotton cord” or “cotton string” — often used for crafts or gardening. You can also use unrolled cotton balls in a pinch.
Step 1: Prep the Area
Ventilate the bathroom — open a window or turn on the fan
Put on gloves and eye protection
Wipe down the tub/shower to remove loose grime
Step 2: Soak the Cotton Rope in Bleach
Pour bleach into a small container
Submerge a length of cotton rope (cut to fit the caulk line)
Let it soak for 5–10 minutes until fully saturated
Step 3: Lay the Rope on the Caulking
Gently place the soaked cotton rope directly on the moldy caulk line
Press it down slightly so it hugs the seam
Cover the entire affected area
✅ Pro Tip: For corners or curves, bend the rope gently to follow the line.
Step 4: Let It Sit
Leave the rope in place for 1–2 hours
For severe mold, leave it overnight (cover with plastic wrap to reduce fumes)
During this time, the bleach penetrates deep into the caulk — killing mold spores and lifting stains.
Step 5: Remove and Rinse
Carefully remove the cotton rope (dispose of it in a sealed bag)
Rinse the area thoroughly with water
Wipe dry with a clean cloth
You’ll be amazed at how clean the caulk looks — no scrubbing needed.
🧽 Bonus Tips for Long-Term Mold Prevention
Wipe down after showers
Reduces moisture buildup
Use a squeegee on glass and tiles
Prevents water from pooling
Run the exhaust fan for 20+ minutes
Reduces humidity
Spray with vinegar weekly
Natural mold inhibitor
Replace old, cracked caulk
Porous caulk traps moisture — recaulk every 3–5 years
Also, consider using mold-resistant caulk (like silicone with mildewcide) when reapplying.
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