Follow these directions for specific types of pillow fills.
Down or feather: Most down pillows can be put in the washing machine. But use cool water and a mild detergent, then dry on low heat. (High temperatures can damage the down.)
Memory foam or latex: Washer agitation can break up slab-style foam pillows, so Handel suggests skipping the washing machine for these pillows. But he says there are some machine-washable shredded foam pillows, so read the care label on your pillow carefully. For most, you’re best off cleaning them by vacuuming the pillow’s surface, then spot-cleaning with a damp cloth and a small amount of mild detergent. Lay the pillow flat to air-dry, Handel says.
Polyester: Wash with warm water on the gentle cycle (washing several pillows at a time will help balance the load). Be sparing with the detergent—use only about 1 tablespoon of liquid soap.
Buckwheat hulls: Empty the buckwheat filling onto a large cookie sheet or into a wide, shallow bowl. Set the buckwheat out in the sun, which will eliminate odors, and wash the shell casing using cold water and a mild detergent.
