Unlike regular pillows, which you can sometimes run and wash under a machine, a memory foam pillow will be rendered unusable when washed under water. This is because a memory foam’s composition includes cell walls that act like sponges when wet. Once this kind of pillow has been soaked, wet and eventually dried, it will not be of the same quality as before. And you have by then ruined your stuff.

Cleaning a memory pillow only involves some dabbing and spot-cleaning. Never attempt to really soak in liquid on it. For easier maintenance and a longer life-span, do invest in a memory foam pillow protector to avoid staining and ruining your precious memory foam pillow.