A Dark Road - S3-E10
Other mistake: In this episode, Michael, Fiona and Sam are boxing in the bad guy's Corvette, trying to make him crash. Despite repeated hits to the side and back of the Corvette, just before the Corvette crashes, there is no visible damage on the bad guy's car.
Chosen answer: It might not actually have one, in which case, he'd have to go down into the club and use theirs. As for showering, going to his mother's house or a gym membership would take care of that.
Captain Defenestrator