After a wonderful winter in Florida 2014. I dumped a bag of ice in tank knowing I had one more night on the road. When I got to the last night cg I was surprised what the ice had broke loose from bottom of tank.
An other tip is a product that lubricates all the tank valves. My handles were getting hard to pull I was afraid I was going to brake. A handle. After using this product my handles pull with much ease. Picked it up at a RV dealer or camping world saved a lot of headache.
There also is a product that cleans sensors available.
Happy RVing everyone.