A while ago I was sent a sample of the Carpet & Fabric Cleaner & Protectant and aside from a quick test have not really had a chance to use this as I am currently without a car. However, I recently spilt some coffee on our carpet and had a chance to test it. Our carpet is about 10 years old and light grey in colour, the coffee was quickly soaked up with some MF towels and that is when I sprayed the CFCP on the carpet. Left it for a minute and then agitated with a soft brush. Residue was quickly removed and the carpet was left to dry overnight.
The following morning my wife was up before me, when I spoke to her I knew as was in trouble and she showed me the spot I had cleaned. It was not good. The spot was clean but much cleaner than the rest of the carpet and now we have a very clean spot which shows up the rest of the carpet. This was easily fixed by moving a chair slightly so the spot is hidden from view.
So, be warned, if you intend to use this product on a light coloured carpet, do the entire carpet and not just one bit or face the wrath of your loved ones.