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I had the same problem until I started to use "Borax" laundry detergent in the tank. The Borax seems to coat the tank with slippery suds, which helps to "slide" out all the crap. Prior to this, I use to run the flush for an hour, and it still would not come fully clean. I add about one cup of the Borax every time we start a trip. Add a little water, and the trip will suds up the tank. We buy the Borax at Wallmart and it is very cheap for a box. We also find that it smells good as well, and we don't have to use a deordorent.
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