Tom Forsythe
Member
- Joined
- Dec 19, 2006
- Messages
- 486
The beauty of the soap free products is that they activate surfactant residues and they get used to clean the carpet and are removed during extraction. The soap-free products produce no foam and should be a go to pre-spray when there are alot of residues. If you add some water to various areas of a carpet, agitate with a bone scraper, you will produce foam when there are excessive residues. The downside of soap free cleaners is that over time the residues are removed and you miss the cleaning that they provide.
Three primary type of ingredients in a cleaning formulation are builders, surfactants and solvents. Soap Free products generally only have builders and surfactant residues in the carpet. Once you have cleaned the same carpet several times you will have diminishing returns when only the alkaline builders are available for cleaning as the surfactant residues decrease. Solvents evaporate over time if they do not stick to the carpet. Our Citrus Solv II added to a soap free product adds solvency and some surfactancy to provide better cleaning.
The following is theoretical and Scott and I have been in many discussions about these principles. The surface tension of soap free products and water is around 70 dynes/cm. Most fibers have a surface energy of around 40 dynes/cm. Oils are at around 25 dynes/cm explaining why soap free cleaners and water does not work very well. Surfactant residues when activated by soap free ingredients reduce the surface tension to around 15 dynes/cm. The reduction of the surface tension allows the fibers to be properly cleaned (wetted). One benefit of not properly wetting the fiber is a limitation of wicking as it is more of a surface cleaning. This is the theory and I would love to hear from experienced cleaners if this makes sense of your experience with soap free cleaners.
Three primary type of ingredients in a cleaning formulation are builders, surfactants and solvents. Soap Free products generally only have builders and surfactant residues in the carpet. Once you have cleaned the same carpet several times you will have diminishing returns when only the alkaline builders are available for cleaning as the surfactant residues decrease. Solvents evaporate over time if they do not stick to the carpet. Our Citrus Solv II added to a soap free product adds solvency and some surfactancy to provide better cleaning.
The following is theoretical and Scott and I have been in many discussions about these principles. The surface tension of soap free products and water is around 70 dynes/cm. Most fibers have a surface energy of around 40 dynes/cm. Oils are at around 25 dynes/cm explaining why soap free cleaners and water does not work very well. Surfactant residues when activated by soap free ingredients reduce the surface tension to around 15 dynes/cm. The reduction of the surface tension allows the fibers to be properly cleaned (wetted). One benefit of not properly wetting the fiber is a limitation of wicking as it is more of a surface cleaning. This is the theory and I would love to hear from experienced cleaners if this makes sense of your experience with soap free cleaners.