Oh, YUK! Use a sewer hose! We pulled in behind some idiot in an older "A", when he saw us making the last corner into the dump station he got out in a big hurry. Never know a MH could peel out like that! We was just dumping on the concrete around the dump station. DH found a long stick and managed to find the flapper to open up to drain all the.......stuff. We ended up cleaning up his mess before we could even think of dumping....wish we'd had a gallon of bleach. We have never camped anywhere that didn't either have full hookups or a very adequate dump station and usually with a water hose to wash everything off.