Fabric softening compositions and methods

A method of softening a fabric article in a laundry process, the method comprising:

• a). subjecting a plurality of fabric articles to a laundry process;
• b). selecting at least one of the fabric articles, but not all of the fabric articles;
• c). providing a fabric softening composition comprising a polyalkyleneoxy polysiloxane, perfume, and water, wherein the polyalkyleneoxy polysiloxane is designed with Correlation I:
• S=3.246(√t#diSi)−1.880(√% Si)−0.9066 √t #EO+17.70 (I)
• wherein t#diSi is the average total number of the Si(CH3)2O units in the molecule;
• t#EO is the average total number of the ethyleneoxy CH2CH2O units in the molecule;
• %Si is the weight percent of all siloxane units in the molecule;
• and the softness index S is at least 10;
• by:
• (i) choosing a desired S value, typically at least about 20;
• (ii) setting a desired average molecular weight, MW, being typically from about 7,500 to about 140,000;
• (iii) setting a desired %EO (weight % of all ethylene EO units in the molecule), then derive t#EO (the average total number of ethyleneoxy EO units in the molecule) with t#EO being typically from about 100 to about 1,800;
• (iv) choosing the type of polyalkyleneoxy polysiloxane selected from the group consisting of:
• polyethyleneoxy polysiloxane, polyethyleneoxy/polypropyleneoxy polysiloxanes, and mixtures thereof, then setting the desired %Si;
• (v) using the desired values for S, t#EO, and %Si to calculate t#diSi (the approximated total average number of dimethylsiloxane SiMe2O units in the molecule), using Correlation I, where t#diSi is typically from about 40 to about 450;
• (vi) calculating t#Si (the average number of all siloxane groups);
• and
• (vii) calculating t#linkSi (the average number of the polyalkyleneoxy pendant groups);
• and
• d). spraying the selected fabric article(s) with the fabric softening composition from a spray dispenser.