Patent ID: 7445643

Claim:
A method of laundering fabrics in an automatic washing machine having a drum, wherein the automatic washing machine is operated so as to cause it to run through at least one wash cycle and at least one rinse cycle, which method comprises: (a) positioning a rigid housing structure within the washing machine in a fixed spatial relationship to said washing machine drum which housing structure comprises a base and an openable and closable lid for said base; (b) placing within said housing structure with its lid open at the beginning of the laundering operation, multi-compartmented insert containing within at least two different compartments thereof at least two different laundry additive materials of which one is to be added to the contents of the washing machine drum during the at least one wash cycle and one is to be added to the contents of the washing machine drum during the rinse cycle; (c) closing the lid of said housing structure with said insert inside to thereby activate means associated with said rigid housing structure to open at least a first compartment of the multi-compartmented insert to thereby permit dispensing of the material within said opened compartment into said washing machine drum; and (d) running said automatic washing machine through its operational cycle, including a spin cycle between the at least one wash cycle and the rinse cycle to thereby activate means associated with said housing structure and/or with said multi-compartmented insert to open one or more additional compartments of said insert containing laundry additive material different from that in said previously opened first compartment, said opening of said additional compartments occurring after initiation of the spin cycle of said washing machine operation, and said means for opening said additional compartments being activated by the centrifugal force arising from the spin cycle; said opening further permitting the dispensing of the material within said opened compartment(s) into said washing machine drum, further comprising (a) during the at least one wash cycle forming in the drum an aqueous washing liquor containing a detersive surfactant component and a detergent builder component, the aqueous wash liquor having pH above about 7; (b) contacting fabrics to be laundered with the aqueous wash liquor in the drum: (c) during the rinse cycle, forming in the drum an aqueous rinse liquor and contacting the fabrics with said rinse liquor; and (d) adding to the rinse liquor sufficient acid source to bring the pH of the rinse liquor into the range of from about 4 to about 7.