Hi Des
Cleaning with M/S gives a very acceptable finish but I never promise more than a freshen up ,pre-vac is the most important part of it and can make a huge difference in apperance on its own but customers seemed to be more than happy with results and with the added bonus of cleaning on site takes away the problem of taking down the curtains which is not always possible ,M/S is safer, cheaper and less messy than solvents.Apart from that curtain cleaning is the most boring job in the world(slightly exagerated)
Mark