I was present when a facilities manager explained why we shouldn't use spray-cleaner to clean whiteboards, because it wore down the paint faster, and repainting it cost $10k, and that they had already paid to repaint them twice.
This was a requirement having to do with the location, I am not sure about the specifics (if it was a city thing or if the building owner had entered into such an agreement) but I'd like to have a better understanding. On the face of it, it does seem absurd.