Shaws choice: Hot Water Extraction
Shaw Industries, of Dalton, Georgia, is the world’s largest carpet manufacturer. It started in 1946 as a small business dyeing scatter rugs. Today it has annual sales of more than $5 billion, and employs more over 30,000 people.
From http://www.Shawfloors.com:
“Research indicates that the hot water extraction system provides the best capability for cleaning. This system is commonly referred to as “steam cleaning,” although no steam is actually generated. The process consists of applying a cleaning agent into the carpet pile and using water in the extractor to recover the used solution and soil. This can be done from a truck-mounted unit outside the home with only the hose and wand brought inside or by a portable system brought into the home.”
“Shaw warranties require that the homeowner be able to show proof of periodic cleaning by hot water extraction (commonly called “steam” cleaning) by a professional cleaning service…”