Mildew can be difficult to remove from silicone caulking because it grows into the caulking. I suggest removing the caulking with a putty knife and replacing it with new caulk. If replacement is out of the question, you may want to try applying Soft-Scrub with bleach. Squirt the soft scrub on the the caulking and let it sit several hours. Rinse throughly. On heavy mildew it may be necessary to let the Soft scrub sit overnight.
Article ID: 619
Created: January 21, 2022
Last Updated: January 21, 2022
Author: Pam Freitag
Online URL: https://sr-manual.com/kb/article/the-caulking-on-my-tub-surround-has-turned-black-i-have-tried-all-kinds-of-mildew-cleaners-but-nothing-works-i-hope-you-have-a-suggestion-619.html