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Do unused drains dry up and get rough inside?

Yes, they do. It takes a few weeks for a drain to dry out, but when it does it can both damage the drain and cause the drain to stink (since there’s no water to seal offensive odors in the pipe). Fortunately, this can be remedied by running some water down the drain every month or so. You can also slow down water evaporation with this plumbing tip: Pour a tablespoon or two of vegetable oil down the drain to keep it moist and slow evaporation.