Then the asshat tells everybody that counts it was all HIS doing that the disaster area was now looking so neat.
I lost my taste for cleaning up other people's disasters, it never did me any good in the end.
You do what needs to be done, even when it doesn't directly benefit you. This is 'professionalism'. Short run, it bites you on the rear end almost every time. Long run? People notice it. Whether you believe it or not, people really do notice professionalism.
I did the same thing at my last job. I was defense contractor working with federal employees. More than a few people in the GS system believe it's a perk to rude as hell to contractors whenever possible. Did plenty of work that wasn't directly my job but I had the time to do it. Helped out plenty of govt employees with random computer problems, or taught them various stuff. More often than not, few if any words of appreciation. I grumbled to myself fairly often, but didn't let it get to me.
When I left for a better paying job, they threw one heck of a party for me. Even people that I didn't like very much slipped me a $5 for smokes (I'm a well known tobacco addict. Cigars, cigarettes, pipes, water pipes, etc etc) and meantion they'd miss me. It was fairly eye opening experience.