Currently, the majority of upholstery cleaners available on the market are wet solutions sprayed directly onto the upholstery. Most cleaners contain degreasers and soap to help loosen and lift oil and dirt. Another type is the kind used in upholstery cleaning equipment. As the upholstery is cleaned, the dirt and any solution in the upholstery are pumped into a different tank. Once the tank is full, it is emptied into the sink. Sorbent cleaners for dry cleaning can also be purchased. Spray them o...