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How to Remove Cured Silicone Caulk

Silicone caulk, used in areas exposed to water and moisture, has a tendency to grow mold and mildew. Some silicone caulks even have organic ingredients that mildew eats. Mildew- and mold-resistant silicone caulk have been developed and if you want to use them, you must remove the old silicone caulk first.

Silicone caulk is an excellent sealant, but over time it will need to be replaced.

Things You Will Need

  • Razor blade
  • Medium weight work gloves
  • Sodium or potassium hydroxide
  • Scouring powder
  • Sponge

Silicone caulk, used in areas exposed to water and moisture, has a tendency to grow mold and mildew.  Some silicone caulks even have organic ingredients that mildew eats.

Mildew- and mold-resistant silicone caulk have been developed and if you want to use them, you must remove the old silicone caulk first.  The task of removing the old silicone caulk is taxing and dangerous to your digits so you must wear protection on your hands.

  1. Scrape away the bulk of the caulk with a razor blade. Scrape off the caulk in long strips if you can to simplify the job.
  2. Lubricate the caulk and the blade with water. Scrape along the silicone caulk slowly; remember the more power you exert, the less control you have over the blade. There will be small remnants of caulk left over.
  3. Mix sodium or potassium hydroxide with water. Apply it with a sponge to the caulk area to dissolve the remnants, and let it rest for a minute before wiping it off. If you leave it on too long, it will damage the surface under the silicone caulk.
  4. Sponge the area with scouring powder and water to remove the scratch marks on the surface from the razor.
  5. Warning

    Wear medium weight work gloves in order to protect your fingers and hands from the razor blade.

Things You Will Need

  • Razor blade
  • Medium weight work gloves
  • Sodium or potassium hydroxide
  • Scouring powder
  • Sponge

Warning

  • Wear medium weight work gloves in order to protect your fingers and hands from the razor blade.

About the Author

Heath Wright has been writing since 2000. He was first published in the eighth grade for his poetry. Since then, he has written journalism for his high school. He was also a contributing writer and editorial assistant for "The Quill," the newsletter of the Pennsylvania Shakespeare Festival. He has a Bachelor of Arts in theater and a minor in marketing.

Photo Credits

  • glazier image by Greg Pickens from Fotolia.com
  • glazier image by Greg Pickens from Fotolia.com