I once left a 5 star review for a hotel purely because the hotel was what I expect from a hotel, but there was someone actively cleaning out the ice machine while we were bringing stuff into the room.

Nothing seemed eslecially clean or cared for while we were there, but I had never seen someone clean one before. Or cleaned the drink dispensers after breakfast is over.

I actually have a UV light I take with me on trips for both rock hunting and for hotels. Some hotels you just learn to avoid.