Fill your washing machine with very hot water until it’s about one-third full—check the wash label to find the maximum safe temperature for your pillows. Then add the cleaning ingredients and switch the machine on, letting it agitate for a little until everything is mixed well.
Put your pillows in with the water and cleaning ingredients. It’s a good idea to do two pillows together so the drum in your washing machine is well-balanced. Allow the pillows to soak well, for about 30 minutes, turning them over if necessary to let the cleaning agent reach the whole pillow.
Then continue filling the machine with hot water. Once it’s filled, set it to run on a complete wash that includes two rinse cycles—if you don’t have a wash setting with two rinses, then set a second manual rinse afterward.