Where do hotel sheets usually go to be washed?

It is usually sent to the laundry room. I worked in a hotel for five years. This industry generally has its own laundry room, which will be near the housekeeping department. To tell the truth, it is very clean when it is taken out of the laundry room, because it will be ironed and disinfected at high temperature. But if the room staff takes it to the store, I can't guarantee that it won't be polluted in the process.