Just 1 point espically for Don!! you are supposed to remove spots and stains FIRST (except on upholstery) not after you have finished your extraction clean!!( that what all the courses ive been on tell you anyway :

)
I have worked for Prochem in the past and admit i did find it difficult to get my head around the MS, also i did think what would happen if i took as much time aggitating a normal prespray for example.
So like Don i did, i used A217 ultrapac renovate a pretty strong baby and did a half and half rinsed them both with an acidic rinse. The results were pretty much similar i had pre vacced prespotted first (Don!) cleaned and set the pile.
I had allways been suspicious about the little pixie saying that the carpets stay cleaner for longer but............... He was right!! the more i clean this carpet with MS the cleaner it stays, By the way this is my own carpet and has been cleaned umpteen times with prochem products!!
Also i clean a commercial site with MS and charley pads and after the 3rd or 4th clean it really is looking so much better even the residents have started to comment how much better they look than when the last cleaner did them!!
Yes you guessed it the last cleaner was ME

I rest my case
Nick