Ice cubes to clean black tank

Ice in the black tank: myth. Black tank rinse systems (such as our built-in one): useful. Periodic use of the "geo method": even more useful. The geo method (various definitions) often involves a cup of dishwashing liquid, a cup of borax crystals, and (optially) a cup of bleach. Drain the black tank, put these chemicals in and follow them with about 1/4 tank of fresh water just before pulling out for a road trip. This approach comes the closest we get to having all the tank sensors clean enough to work again, so we know it's doing some good on the inside of the tank.

Rob