Always, always ALWAYS do the proper test prior to commencing curtain cleaning!
I recently cleaned a cotton moire suite using ms and hwe through a drimaster handtool. Perfection.
Curtains at both ends of the lounge made from exactly the same fabric so after thorough kirby dry vacuum I gave them the same treatment (DIDN'T DO A SHRINK TEST
!!!)
Despite receiving £180 for the curtain clean, It's cost me £125 to have them completely taken apart and remade to the original length. All for the sake of not carrying out a 2 minute shrink test.
The suite is fine, the cushions are wedged in place - theres definately no shrinkage there.
Fortunately they're nice folk and they've already booked in next years clean on their brand new Ryalux throughout
Alan