Perchloroethylene is used by almost every dry cleaner in the United States.
Washing - drying 1 or 30 shirts is only one load. The time to pull out a board and iron 30 shirts is less than the time to load them up drive to a place and repeat when you pick them up.
The best are those hanging steamer/dryer closets. Fancy stuff though.
Or do you mind if I outsource some of these things occasionally?