Class C Motorhome. Didn't know of this forum at the time. We took it out for one night (1st time) Only did #1 in it. I'm sure it barely had anything in it. We dumped both tanks, black first of course. Then brought it home and there it sits in the driveway, EMPTY! Did I screw up? I read on the sewer info on this site I need to keep my tank 1/4 filled with water & deodorizer. How do I get the water in? From the outside or by dumping it right down the toilet with a bucket? Also if I go out for an overnighter again and barely use the toilet can I store the RV for a period of time w/o emptying what's little is in it? I read you're not supposed to dump until 2/3 full at least. Is it too late? Have I screwed up my sensors with rotten TP stuck to them? PLEASE HELP! ???