Not one time have you mentioned that they asked you to clean for them. YOU are a clean freak. YOU put it upon yourself to clean for them. You DO NOT have to clean for them simply because YOU like to be neat and tidy. It's more likely than not that it's offensive to THEM that you are being a maid for them. I would be so pissed off if any of my friends or boyfriends that I do not live with began doing the dishes they did not make and cleaning the house for me when I did not ask them to. I would be SO. PISSED. OFF. That is beyond rude and insulting. It truly is. It's not your job to pick up after them and it is not your place to be upset when you bring it upon yourself to be the maid for being a clean freak and get no help. Not your job. Not your problem.

If you really want to make it a big deal, clean up after yourself, NOT them. They are perfectly capable of doing the dishes themselves. Don't cause unneeded drama for involving yourself in household duties because you're a clean freak. You're not the maid. You do not live in that household. Do your share and let them do their share.