Patent ID: 7476258
Filing Date: 2009-01-13
Classification: D06F

Abstract:
1. A method of washing a laundry fabric in a wash liquor in a washing machine, said wash liquor containing surfactant material, wherein during a single wash cycle no more than 10% by weight of the wash liquor is drained from the washing machine, wherein said method comprises the step of varying the ionic strength of the wash liquor over at least 10% of the duration of the wash cycle by addition of one or more ionic ingredients to the wash liquor, and wherein the lowest ionic strength of the wash liquor is from 0.001 to 0.06 M and the highest ionic strength of the wash liquor is from 0.01 to 0.5 M; wherein said one or more ionic ingredients added to vary ionic strength consists of sodium, potassium, ammonium or magnesium salts of sulphate, natural soaps or mixtures thereof.