Are people afraid to do curtains, its really not that difficult to get decent results.
as a general guide for most materials , vac, mist m/s, aggitate with micro fibre cloth then simply towel off if not to bad , or a terry towel over the head of a steam cleaner running along the curtain whilst supporting the back of curtain with a plasterers board, " the board was a tip from john kelly and works well" or simply extract with a l/m tool again using board. My prefered method is the steam as it does dress the curtains as well.
Geoff.
ps The steam method was taught by Derick Bolton on one of his courses .