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Today when I picked up Hanna from the RV hospital, I talked with the lead technician. He said to use Cascade Liquid. Just a couple cap fulls in about a 1/3 to 1/2 tank of water. Run on down the road 50+ miles or until you get to your next CG, then empty. It will clean the tank (grey or black) Be careful of soapy products as the suds could get you in trouble if you over do it.
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