== References ====External links==*About.com, Housewares/Appliances, What is HE Laundry Detergent & When are High-Efficiency Detergents Used by Mariette Mifflin*Campbell tips for detergents chemistry, surfactants, and history related to laundry washing, destaining methods and soil.
* [http://housewares.about.com/od/laundryappliances/f/hedetergents.htm]* Campbell tips for detergents chemistry, surfactants, and history related to laundry washing, destaining methods and soil.