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crwdns2934241:0crwdne2934241:0 Deliberate David

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Thanks to all who have contributed answers, which helps to get an idea of what works, and for how long.  I wound up taking the whole case off my dehumidifier to see how bad the gunk growth was inside.  I found it was surprisingly clean in the drain pan above the L-shaped tube that comes out of the bottom of the pan.   [link|https://photos.app.goo.gl/Vwn5MzASQinH32jB8|Photos here (click the 'i' to see my captions).]

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open