This method is frequently called "steam" cleaning due to the fine spray of water used to force dirt out of the carpet which is sucked up by the vacuum slot immediately in front of the spray. Seldom is real live steam used, however. This process consists of spraying a solution of water and detergent into the carpet pile and recovering the water and soil with a powerful vacuum into a holding tank.
Rotary Machine method (Bonnet)
Bonnet cleaning employs an absorbent pad ('bonnet') attached to the bottom of a rotary machine. Detergent solution is sprayed onto the carpet ad the rotary pad is used to agitate and remove the soil suspended in the solution from the carpet. Once one side of the pad gets soiled, the sides can be reversed. And when both sides get soiled, the pad can be replaced and later cleaned.
This method is used in the regular maintenance of commercial buildings.
