I worded my response poorly. I wouldn’t think twice about performing a major cleanup at a gas station, etc. Gotta do what you gotta do. I’ve seen much worse walking around Missoula!
As far as washing hair in camp… My wife and I were on the AZ Strip last year. The red clay down there is the worse you’ve ever seen. We get back to camp after an entire day of scouting and almost 200mi on the UTV and my wife just starts laughing at me. My teeth and eyes were white, everything else was reddish brown. Like an Oompah Loompa. Then… she looked in the mirror. Between her already greasy hair from several days of camping, combined with the dust, she had a good start to some dreadlocks. We have a wash basin and an even bigger Tupperware basin for dishes in our camp set. It took several wash/rinses, but yeah, did the full wash of her hair at camp. Funny thing is, it wasn’t the first time. We also tubbed both our boys in the same basin on several hunts when they were babies at camp.
It’s a bit of a pain in the ass, but on a few occasions she has got to the point that she couldn’t stand it and had to do something.