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Ed Sowell Ed Sowell is offline
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Default Mildew on or in silicone sealant

This is in a shower constructed with a cultured marble-like substance called
Granitex. The joints are sealed with a clear silicone sealant. Some area
have blackened.

I've read that mildew resistant or free silicone sealants are available, but
thought I'd look into alternatives before replacing it.