We have a molded shower in our Winnebago Journey. I get black mildew or mold on the caulking below the molded shower panel. I have tried spraying bleach on it but the black is still there. Any sugge...
Sometimes clear silicone caulking is used in shower enclosures. Mold can form under the caulking and show thru the clear as if it were on top of the silicone. Bleach has no effect in this case and you must pull out the old caulking, treat the mold and re-caulk.