Squishmallow manufacturers do not recommend washing their products in a washing machine. Still, people do it anyway for convenience and have had success.

Low-sudsing detergents create less bubbles in your machine, and are often labeled as HE detergents. [4] X Research source Stay away from fabric softeners when washing your plush as they can distort the soft, squishable fabric.

Use clothespins to hang your plush on a drying line. Simply clip it up by the ears, tentacles, or fronds, depending on what Squishmallow you have. [6] X Research source

When it comes to spot cleaning a plush, always avoid rubbing a stain as this can spread the stain and cause damage to your Squishmallow’s soft fabric.

Stain remover pens work best on food and drink stains, but some pens are formulated to treat ink and bloodstains. The faster you treat a stain, the faster it’ll disappear![12] X Research source