I remember one got shut down once that was run by polish folk,old H&S and the enviroment army hit em bad,summit to do with the chems they were using weren't bio-degradeable,also there washers were electric so no breakers were fitted.
They were running this from a very busy golf club car park to,i dunno,have a hunt around see what ya can find,as long as you go the right way about it why not give it a try.