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Thread: What's the black gunk in my drain and how do I prevent it from forming?

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    DIY Junior Member rafael's Avatar
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    Default What's the black gunk in my drain and how do I prevent it from forming?

    Hey all,

    It's been 6 weeks since I flushed out my bathroom sink with baking soda and boiling water. That made everything shiny and the water flowed just fine. Now, it's got a bunch of black goo that looks a lot like grease on the drain and stopper.

    Any idea what causes this stuff and how I can prevent it from building up?

    Apologies for the out-of-focus pictures.
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