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--Ty-- t1_j24s7mt wrote

When did you get this shower installed? It looks like the installation has failed, there's rust along the entire perimeter of the caulking bead at the bottom, the whole shower has failed. I would stop using it if I were you, there's probably a lot more water damage than what you're seeing. It's time to call the installer.

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timpham OP t1_j255tnk wrote

It's from the previous owner. Probably DIY. If you see the rust on the caulking bead, could it be soap gunk? I guess how can we tell if all the seal joints have failed?

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--Ty-- t1_j25ejj0 wrote

I mean, you should be able to see with your eyes if the caulking has cracked or pulled away from the wall. And unless you use brown soap, or have never ever cleaned your shower, I'm gonna bet that what I'm seeing in the photo is more rust.

See if you can pull the caulking out of the corners. If it is rust, then the caulking will already be fully detached, and should come out fairly easily. If this is the case, then you need to remove all the caulking from the entire shower, let everything dry for a day or two, fully scrub and clean and de-grease the edges, and the re-caulk the entire thing properly, with a 100% silicone Bathroom-rated caulking.

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