@ Clive.
I use a back pack vac, dri-pro with a boost then towel down both sides.
I also have a steam pro press to take out wrinckles etc, but really it's for effect.
I've never had a problem with customers regarding quality of work and the great thing is if you have a customer who is an an old lady, they love it because it's too much for them to take curtains down, take them to the cleaners, then re-hang them.