Hello fellow Coach Guys,
Something I share with my luxury coach friends is they have the resources to keep their tanks clean, dump valves operational and tank probes accurate. If you have an Aqua Hot, Hydro Hot or Hurricane, you have an unlimited source of 120 degree hot water. Go to Ace hardware and buy the faucet adapter that will fit your water bay swing faucet (see foto). Fire up your Aqua Hot on diesel and get her up to temperature. Attach a hose from the faucet to your tank flusher. (don't worry about contaminating your water because the flusher goes thru a vacuum breaker on the way to the tank) Put 6 ounces of DAWN ultra down the toilet and fill the tank. Let it sit for about an hour or so and then dump. The grey tank you may have to be more creative depending how your coach is configured. Add your favorite recipe for oder control. I do this twice a year and save money.
Regards, Fred