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I use Tank Tec RX in a partially filled tank while traveling or in a full tank while sitting in a spot, give it two to three days minimum. Works wonders. Also while traveling it is good to use a cup of Calgon water softener and 1/2 cup of dawn in a 1/3 to 2/3 tank. I had a very bad problem once before I started using these methods and hired a Mobile RV guy to pressure wash the tank. Locally in Casa Grande, AZ Jim’s Mobile RV repair is the best you can find anywhere.
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