How to wash a 3 season envelope double sleeping bag?

1,Follow the instructions on the 3 season double sleeping bag or the tag that came with the sleeping bag. The manufacturer knows best about what works for the particular bag.
2,Clean stains and spills off with a sponge when they occur. Pre-treat stains on synthetic-fill sleeping bags before washing.
3,Wash either a down or synthetic fiber envelope double sleeping bag by hand or in a large washing machine. Hand-washing is tough because it takes a lot of rinsing to get the soap out.
4,Use a front-loading washer or a commercial washing machine. A sleeping bag can be hard on the machine and vice versa because the machine agitates roughly with a large bulky item.
5,Zip the bag before washing.
6,Wash a down bag in warm water with a mild soap like Woolite or Ivory Snow, not detergent. Do not add bleach or fabric softener. Synthetic-fill bags may be washed with regular laundry detergent, and fabric softener may be used.
7,Process the bag through another wash cycle – without soap – to completely rinse it. Soap residues can cause clumping of the insulation and loss of loft.
8,Handle the bag carefully when wet. Press – don’t wring – the water out. Wrap it up in a ball and transfer it to the dryer.
9,Clean a down-filled sleeping bag occasionally to keep it fresh but also to maintain the loft (fluffiness) of the down. Do not dry-clean down bags unless the manufacturer insists on it, as the cleaning solvents can strip the feathers of natural oils.
10,Dry a down bag on very low heat with a clean, rubber-soled athletic shoe or a tennis ball. This fluffs the down and breaks up clumps in the batting. Thoroughly dry the bag before storing, though this may take some time.
11,Dry a synthetic-fill bag on low heat, but it can also be dried outside. Lay it flat to dry.