Caulk Mildew-resistant caulk

Published on May 17th, 2018 | by Henri


Replacing mildewed caulk

Q.  What is the best way to remove caulking that has mildew underneath it and to redo it after?

A.   The caulking is most likely silicone, known for mildewing. You should be able to release the edges on both sides of the bead, using a sharp knife or utility knife, being careful not to damage the surrounding areas. Then pry out one end with a screwdriver, grab it and pull out as much of the caulking as will come; you may need to use pliers. You may have to repeat this a number of times.

You will have to remove any residue and mold spores in order for new caulking to adhere properly. Any residue can usually be removed by scrubbing with a stiff brush and mineral spirits, but do not use mineral spirits if the adjoining surfaces are painted or have a similar finish. In that case, substitute denatured alcohol.

To remove mold spores, clean the area with a Clorox bleach solution in warm water, using a sponge. Let the area dry overnight.

Choose a caulking with anti mildew properties, such as Sashco (, which has a strong 7-year warranty, including labor to clean and redo the job. Others are GE Supreme Kitchen and Bath, DAP’s KWIK SEAL PLUS Kitchen & Bath Adhesive Sealant with 5MICROBAN, etc.

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