used it as a prespotter on some nasty coffee stains prior to rotary cleaning or encapping large commercial areas and found it rather good to be honest......... did a really heavy decaff stain in an office communal area on friday, it was confirmed as being decaff, it had been down a fair while, and the client was told it probly would not budge, he was fine, understood after i told him about the decaff coffee scenario , but after pre spraying and leaving to dwell a while, it was about 98 % removed, which i was not too pleased with, as there was a still a light stain, client however was very chuffed............... so question remains, coffee is difficult, what do you use to greater effect???