Pure Green Janitorial, LLC recently tried out a carpet cleaning product called Procyon Extreme Carpet Pre-Spray. It's approved by the carpet and rug institute and is Green Seal Certified among others. It's very versatile, it can be used for carpet and upholstery. It can be used with truck mounts, box extractors, bonnet cleaning, hand spotting and as an encapsulation. One gallon can cover about 10,000 square feet. So far we've had really nice results removing coffee, soda as well as other stains and none have returned after months