I have a customer who converted one of his SS bays into a small single detail shop. He originally had intentions of using this bay for SS when not detailing but with the bay always being wet and dirty, it became impossible to use it for both - It took too long to do a proper clean up job in order to detail in the same space. Detail shops need to be neat and tidy, and preferably dry when possible - He uses his other SS bays for washing the car before bringing it in for paint treatments.
By dedicating a bay permanently my customer was able to install proper low level lighting (4-5' off the ground on the wall), heat, ventilation, and shelving for supplies. As well he installed a central vac system with hot carpet extraction so he did not need to have the clutter of a portable unit.