I've just finished removing all the glass and metal hardware that was
the door to my fiberglass shower stall. Silicone caulk was used on
the door frame sides and there was a bead on each side of the
threshold. But under the threshold was some white, flexible caulk
that acted like it never really cured and there was a lot of it.

I'm doing my best to clean everything up and hope to hit a boating
supply store this weekend to see what kinds of caulk remover they
sell.

What I'm not sure of is what the under-the-threshold caulk was. I
know if it had been silicone I may not have been able to get it loose,
so I'm interested in using similar stuff again. Does anyone know what
this stuff is and what I need to buy?

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