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I've had moldy, leaky silicone in my shower for a while, and decided it's time to replace it. But I got over-eager in pulling it out and got a chunk of an also-moldy rubber seal/spacer/gasket that's between the tub and the metal frame. There's a picture below. Right now, I'm trying to figure out three things:

  1. What's it called, anyway?

  2. Should I worry about the fact that I took out a chunk of it, or just reapply silicone over the space (and maybe try to fill the space with silicone)?

  3. It's pretty moldy — can it be removed or replaced without taking the glass side off?

a chunk of clear, but moldy, rubber the width of the shower glass has come out from in between the glass and the tub

Any thoughts that help me avoid setting myself up for future leaks would be super helpful.

  • Hello, and welcome to Home Improvement. My guess is that you won't get a really good seal unless you start from scratch. And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Dec 6 '19 at 17:55
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It is moldy and your best bet would be to remove the glass and re-install it as if it were new. Remove all the caulk, rubber seal and clean the bottom and sides of the glass frame. Scrape all surfaces with a single edge blade to remove any film and then clean with vinegar to kill off any remaining mold. Let the surfaces totally dry. Put a bead of quality silicone caulk on the tub and wall surfaces where the glass frame will sit. Mount the glass/doors and then caulk the entire inside of the tub, tub to glass, tub to wall and wall to glass Also caulk the miter joints on the frame. Wait a day and then caulk the entire outside of the tub.

If you can't remove the glass, do everything else and try to clean under the frame as good as possible. Scrape, clean, dry and caulk like above. Good luck.

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