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How to clean a down pillow
Remove the pillow protector.
If you use a pillow protector for your down pillow, you'll want to remove it and wash it separately. You can typically wash your cover with the rest of your clothes if it's made of cotton.
If the cover is made of a delicate material like silk you'll want to run it through a separate, delicate wash. If the cover is made of silk, make sure to air dry the cover instead of putting it in your dryer or it may shrink or get damaged.