happyjack2 - I do a slight modification to your procedure. I merely loosen the clamp on the fitting that enters the tank. Then take a 7/8" open end wrench and unscrew the male adapter from the tank. Then plunge that hose and fitting into the RV antifreeze. After getting the solid, not diluted, pink stuff at all the faucets, I screw the fitting back into the tank and tighten the clamp. This is all under the dinette seat. By the way when the tank is completely empty, it is very light. So...I slipped a web strap underneath it and tied a bow on top. Now I am able to lift up the end of the tank away from the drain and get "all" of the water to drain.