Check the care label to confirm that your pillow (down or synthetic) can be machine washed – most can be.
Remove the pillow case and any pillow protector
Fill the washing machine about 1/3 full with HOT water (I even added a couple of pans full of boiling water).
Add all the ingredients in the Miracle Whitening Solution (or, if you’re just looking to wash your pillows, add your detergent now) then start the machine and allow it to agitate for a few minutes to makes sure all the detergent dissolves before adding the pillows.
Whiten yellowed pillows
Once the detergent is dissolved, add the pillow(s), and then allow the washer to fill the rest of the way with HOT water. I washed two pillows at a time, which helped balance the load when it came time for the spin cycle.
Whiten yellowed pillows
Agitate the pillows for several minutes, then turn the pillows OVER to allow the top side to get the full effect of agitating in the HOT water. Agitate for several minutes more.
washing pillows
Put your machine on the 2nd rinse cycle or just run it through twice manually.
Download the How to Wash & Whiten Yellowed Pillows PDF guide for easy reference.
DRYING your pillows:
For down and feathers, use the air cycle. For synthetics, use the low heat setting.
Whiten yellowed pillows
Place the pillow(s) in the dryer, add a couple of tennis balls covered in clean socks or a few Homemade Dryer Balls to help FLUFF the pillows as they tumble dry. (If it’s a nice day you could also set them outside in the sun to dry!)
Source: onegoodthingbyjillee.com