Source: Nationwide Consumer Testing By Richard Byrne
The best cleaning found by Nationwide Consumer Testing is the Circular Dry Foam system. They said, ”Our research shows that the Circular Dry-Foam system with separate initial and finish vacuuming, really removes the dirt and keeps the carpet looking better, longer."
The Circular Dry-Foam system had a very high level of soil removal (92.3%) with little or no soap residue. They don't use harsh detergents which are oily or sticky. Carpets resoiled in 12 to 16 months. Drying time was from 45 minutes to 2 1/2 hours with the average being 1 1/4 hours."