Hi,
did a shag pile last year, it was cream in colour and wool. Spent a good half hour vacuuming with my sebo and picking small childrens toys out of it, it was that deep !
Sprayed lightly with PS Gold and agitated well. Extracted with FF Rinse with loads of dry passes. I placed my blower in the room for about an hour while cleaning other rooms, moving it everyso often. Then groomed afterwards.
The carpet was not in a bad condition and came up very well. Having the blower going for quite a while helped alot with the drying process, though difficult i suppose if its the only room you've got to do.
good luck.
Cheers.
Ben.