Absorbent Pad  Method  AKA (Bonnet) (Electrostatic) (Chemdry) (semi-dry) ( liquid dry cleaning)
This system when done correctly can provide a good surface cleaning. A pad made from nylon The absorbent pad method should be used only by a properly trained cleaning professional. The rotary bonnet method uses a machine similar to a floor buffer with an absorbent spin pad attached to remove the soil. The spin pad absorbs soil onto the pad, and soil is removed when the pad is rinsed. To reduce pile distortion, keep the absorbent pad well lubricated with cleaning solution. Replace pad often to prevent transfer of soil back to the carpet face.

Dry Compound Method AKA (Host) (Capture) (Non-emersion)
This system uses cellulose particles saturated with detergents and solvents. It is normally broadcast onto carpeting and then worked into the fibers with especially-designed machines or brushes. The compound attaches to the soil particles, and both the soil and compound are then removed by vacuuming.

Dry Foam Method (neutral clear clean)
In dry foam cleaning a detergent solution is frothed into a foam by an air pump and directed onto the carpet. The foam is worked into the carpet by a especially-designed machine with reel-type brushes. This process is normally  followed by wet vacuuming.    Some machines have their own extraction capabilities while others need thorough vacuuming after the carpet is dry. This process is an interim cleaning system and needs to have periodic extraction for long term success.

Dry Cleaning

Dry cleaning uses a volatile dry cleaning solution. The process can also heat the solution for maximum effectiveness. This process is reserved for special circumstances.

Hot Water Extraction Method AKA (Steam Cleaning) (Extraction)
This method is sometimes called "steam cleaning." Areas of heavy use are preconditioned to suspend ground-in soil, then a pressurized cleaning solution is injected into the pile. Suspended soil and solution are immediately extracted. Follow directions carefully and avoid over wetting. Ensure speedy drying by using fans, operating the building air conditioning system (HVAC) in the "on" position, and by performing additional drying strokes.

Rotary Shampoo AKA (Dry Foam Extraction)
The rotary shampoo method uses a typical floor machine with a tank and rotary brush.   The entire weight of the machine is supported by the brush so a stiff brush must be used and this can be very aggressive especially on cut pile carpets. the  cleaning solution is shower fed onto the carpeting where the brush agitates it into a foam. Some equipment types have a small vacuum on top that will vacuum the shampoo residues off the surface of the carpeting. This system leaves a lot of residue in the carpeting and should be combined with hot water extraction for a complete deep cleaning. This system is necessary on very dirty restaurant carpet or when the carpet has been neglected and needs corrective  cleaning.