Hi,
I used ultimate master in the same way as Derek...as a prespray with a fresh water rinse. Found it worked well and extremely economical.
I am now using microsplitters which although not as economical, I have found work better, highly effective on a wide range of stains.
One gripe I had with U.M is the scum residue it leaves in your solution tank, buckets etc.
Kind Rgds
Tony