someone send them a littering bill

sadly one day hundreds of years from now parts of the moon will look like all the garbage left on Everest (and maybe even the dead frozen bodies too, moon dust is sticky and very sharp apparently)

That's the neat thing. Dumping on the moon or anywhere (other than Earth) isn't possible, as the litter is infinitely more valuable than the existing dust and rock. It's as if someone was dumping gold bricks into your yard. You really wouldn't mind at all, and would ask for more. The only exception would be radioactive waste, as that is less valuable than the surrounding dust and rock.