Steve MS have always been used with a fresh water rinse, infact ive heard sellers claim that a deturgent rinse could counteract the m/s and make it less effective, regardless of this ive recently tried Formula 90 (thanks to a few suggestions on another board), i run it through metered at 1000-1 to 2000-1 depending on soil in carpet (thanks shuan) and im must admit im very impressed. I even tried just F90 on a carpet that had just been prevaceed and it came up failry well (not as good as those that had been prespryed and agitated), i found it hard to get my head round how a carpet could be just cleaned with Heat and Chemical leaving Agitation and Dwell time redundant (remember the CHAT pie). Ive also heard loads of good things about Hydra Dri so ill be triing that next.
Hope this helps
Dene