Bleach will kill off the black mold that grows on this stuff, but will not help actually clear the blockage. Drain cleaner may also clear the blockage, but I would be concerned the heat generated could damage the basin. Once loosened, the debris can often be flushed out by running water into the overflow. Short of that, the slots can often be mechanically cleared somewhat with a stiff hooked wire or similar tool.
The best way to clear overflow blockage is to disassemble the drain assembly. The main drain will work fine, but the overflow will only collect so much before it fills and stops working. Attempts to clear the stopper area of debris can push more material into the slots, compacting the material into an impenetrable blockage. Some of this will end up getting through these slots. Grease, hair, and soap scum often build up around the stopper assembly that occurs in the same area. This is usually through small slots in the top of the tailpiece that aligns with the overflow area in an interstitial space between the inner and outer basin surfaces.
The overflow outlet into the main drain is obstructed. Not only is this an unusual configuration, but faucets should not be leaking anywhere as well.Įven lacking a reasonable explanation, one thing is clear. Perhaps your basin has an unusual configuration that allows leakage from the faucet to collect in the overflow area. I'm at a loss to explain how water is getting into the overflow area such that it runs out the inlet.
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