Thanks for some good ideas (and some not so good... lol)... When I do dump the tank at the campground, I am able to flush it with water (has a water inlet valve on the top, for flushing), so the portable does get clean. And I have started taking the tank home, dumping at another dump site, on the way home (saves time). And unfortunately, I do not have an easy way to dump the portable at home (no sewer lines to dump into, without going into the house... and the wife has already said "NO WAY" to that...lol)... I have considered calling a company, to empty the waste. I may have to check into that more.. Thanks everyone!
