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Bathtub caulk turning dark color in spots?

About 4 years ago I had the bathroom remodeled. A new surround wall enclosure and a tub put on top of the old one. It all still looks great except the caulking between the tub and the wall enclosure.

Its not coming off and still looks smooth and not breaking up. But,
in the past year its gotton dark spots in it. Not along the entire bead, but just in several places. We have tried to use several cleaners, but
nothing touches it. We use city water, and there is no sign of mold
anywhere else in the bathroom or the house. We had a new ventalation fan put in at the time.

So is there a way to touch up the color somehow, without recaulking?
Can it be "cleaned" out somehow with cleaner?
Is it just plan mold?

Posted by on

  • msny Feb 01, 2009

    Well I found this article.

    But I'm no expert at recaulking.

  • Thomas F. Schneider May 11, 2010

    Yes. It is likely just plane mold. Try one of the mold removal products on the market made for this purpose. I beleive (TIle-X) brand might be one of them?


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Ibelieve it is mold and the best thing to do unfortunately is re caulk it but use amold resistant caulking(kitchen and bath dap)

Posted on Feb 02, 2009

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