Greetings from a New Class A owner!

Reference your Black Water tank. You don't have to do much cleaning it out except rinsing it once in a while. Just do NOT hook up to a sewer and leave your BLACK TANK VALVE OPEN! Leave the valve closed until the black tank is about 3/4 full, and then open the valve. If you leave the black tank valve open all the liquids will run out and the solids will stay in the tank and then you WILL have problems. Also if you have some kind of a Black tank sprayer in it to clean it, DON'T DO ANYTHING ELSE UNTIL YOU SHUT OFF THE WATER, or you may forget about it and it may run over inside your RV. Also when you flush your black tank and grey tank, pull the black tank handle first, then when that is done running out close that valve and pull the grey tank valve and that will clean out your sewer hose. Then when done add a couple of gallons of water to the black tank. Good Luck.