I just wash up in my large (8qt) cook pot. I heat some water in it, add detergent and start in. I rinse in cold water in a plastic basin on the table. And I use a 4-gallon bucket for a "gray water" tank. I just carry it to where ever the campground want me to dispose of it.
A sink, especially one that could be covered, would be great, but it's way down on my list of projects/problems. I can't even figure out how to hang a side table off my teardrop. The place where a mounting track would have to go is behind the immovable, original ice box.
<Chas>