I'm not sure there are ANY sensors? Isn't it just a bare flat piece of metal that measures the ohms from it to the larger one on the bottom? Cleaning it would be the same as replacing it? But then I'm not an expert on these so could be wrong. This has been a problem for all 4 of the RV's I've owned. When paper gets all over the "sensor" it increases the ohms trying to tell you the tank is full. But I agree with almost everyone else they are very close to worthless.
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