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Question DetailsAsked on 9/19/2014

I have two undermounted sinks. There is serious mold build up. Bleach doesn't work.

The sinks were recently installed. The most recent one year ago.

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1 Answer


Some of the epoxies and urethanes used to bond undermount sinks to the countertop seem to be an ideal growth medium for mold - I learned to use mold-resistant Dap or similar latex caulk at the interface edge so the glue is not exposed at the sink - this not only last a long time without molding, but is easy to scrape out and replace yourself.

I would have the installer come and route or grind out the glue at the exposed edge, and then caulk with a mold-resistant caulk in appropriate color - though this does make for a visible caulk line around the sink.

If you want the color match, then I guess use another mold killer - one that is safe for your type of sink material - might be hydrogen peroxide, a commerical mold killer, pure denatured alcohol, muriatic acid, boiling water, paint thinner, etc. - can't say which because all those will wreck major damage on some types of sink and countertop materials and each will dissolve certain types of adhesives - which is why I recommended bringing back the original installation company. If you call them and tell them you had a countertop/sink installed by them a year ago, they might tell you their cleaning material suggestion over the phone for free - try that first, then if it does not work call them to ream out and caulk kthe joint.

You could also try, if you know the manufacturer of countertop and sink, checking their website or eMailing for suggestions.

Answered 3 years ago by LCD

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