Dean thinks all this is freaking hilarious. Even the piss all over the toilet. If this had happened back at the motel, he'd be on the floor laughing.

But... they're on FDR's turf and he's Vulcan levels of neat freak, and not too proud to throw bitch fits over it. So he doesn't think it's funny. Instead, he's sobering up like he's been thrown into a job.

"That's not a car wash. That's not how you do it," he says to Baby. First order of business is to turn off all the water.

"Okay. If you wanna get clean, you need to get naked-" Dean tugs on the wet leather jacket (and quietly mourns its passing). "You gotta take the tarp off," he explains and feels so stupid for wording it like that.

"Just take off everything that comes off. Okay? I'll clean up your other mess, and then we'll go to the next step. Got that?"