Did 2 white rugs on our driveway this afternoon, one a customers (wool) and one ours (synthetic). Used the same process on both, pre vac (and yes with a dyson
), hose down, hot pre spray (power burst), scrub with rotary, hose off, extract and blower dry.
The wool one has come out a treat.
Ours developed brown lines on the face side
Both were put face side down on cotton dust sheets.
After a minor panic I rubbed the brown lines with hot oxibrite and they went.
I would put a picture up but can't find how to do it.