Thanks for your advice Simon,
I went back to look at the carpet this afternoon and rinsed out it with Hiation cotton cleaneras as it has a reducing agent
I then applied Chemspec Browning remover, it looks a hell of a lot better, just a very slight yellow , you have to strain your eyes to see it ! I just hope the customer dosent see it tomorow ! Lol
if I do get a ring back I will take your advice and have ago with your procedure
Stuart