Both Les Mills gyms in Wellington (New Zealand)are absolutely disgusting by 6pm. The scum and the mould in the on the floor sits there day after day, and yes, I did complain a few times about it. The cleaner at the main gym seems to knock off at 5, just before the rush! And to top it off, the (uncleaned) urinal is right next to the entrance to the locker room (or "changing suite" as they euphemistically call it), so you get a lovely blast of old pee as you come in the door (works for some, probably!! :D )
Shower cleanliness is almost at the top of my list now that I'm looking for a new gym here in Paris.