Glad I'm not the only one. ALWAYS if possible I clean up at the end of a day.Cut off the top half from a gallon jug and you can create a small reusable and disposable basin. It is small enough to pack things inside of it to make use of the room. Then chuck it in the recylables when you are done.
I like to be as clean as possible at least for the journey back home. I can't even stand to smell myself if I'm alone. I can shave with just about any lather and a razor. That's all I need. I have used the bio soap as a shampoo, too and it works pretty good.
Heat some water or just enough to be lukewarm, a little bit of biodegradable soap and you'll be amazed at how refreshing this is. Cold water can be invigorating too.