Brush off surface dirt. Follow manufacturer's directions if they are available. Use a bathtub or large sink. Then wash by pushing down on pillow, releasing, and pushing down again. Rinse the same way.
Pillows can be machine-washed on gentle cycle with lukewarm water plus a disinfectant.
Rinse well in lukewarm water. Gently squeeze or spin out excess water. Blot with towels. Dry away from heat and sunlight. Do not dry in dryer unless on an air only setting.