thankyou for your advice, very helpful. i went back a couple of times and did pretty much what you said, but i used my multi clean pre spray, part diluted with a hard brush to get it right in the pile. left to dry, it did help, but a slight staining still remained.
after that experience, i always tell my clients that i can remove between 80-95% of a stain. that way, it gives me 5% to fall back on, just in case i cant. honestly, though, people expect, NO MATTER WHAT, that by getting a professional carpet cleaner in, will mean that there carpets appear to be 'just off the roll'
we can only do our best! :-)