Bike Dr. I have owned my 2007 Gulfstream Cresendo for 3 years. The Black water always shows full, even after dumping the tank. I have flushed it but no help. I have read about 4 bags of crushed ice and drive around for an hour to clean the sensors. I read your reply on Sunday about the Cascade Dishwasher cleaning method. I just finished emptying my tank, using the dishwasher cleaning granules and for the first time in 3 years, my sensors read empty and as I filled it up with water the sensors lit up. I am thrilled that this worked and you took the time to respond about how you keep your sensors clean! Thank you.
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