To wash a comforter, follow these general guidelines:

1. Read the care label on your comforter for specific instructions.
2. Check your comforter for stains or holes and spot clean them.
3. Load the comforter into a large capacity washer thats big enough to accommodate it with ample room to spare.
4. Add a small amount of mild, fragrance-free detergent without any additives to the washer tub.
5. Select the proper cycle and water temperature settings. Most comforter care labels recommend washing in cold or warm water, as hot water may impact the comforters filling. Wash your comforter using a bulky, bedding, or delicate wash cycle, and use an extra rinse option if possible.
6. After washing, dry your comforter using low or no heat. Drying instructions can vary by comforter, but generally, its best to dry using low or no heat.

Its important to note that some materials, such as wool or silk, can be damaged or shrink in the washer, so if the label says "Dry Clean Only," its best to let the professionals handle things.