Run bristles under warm water or submerge in a bowl of warm water.
Swirl the bristles over the soap pan, rinsing and repeating until a light foam begins to form.*
Once slightly foamy, use fingertips and hands to gently massage away oils and pigments, rinsing and repeating as necessary until pigments are no longer visible and a rich lather has developed.
Rinse under running water or swirl in clean water until they feel squeaky clean.
Squeeze the brush head in a washcloth or towel to remove excess water and reshape.
Lay flat on a counter with the head hanging over the edge in order to assure full air circulation while drying.
*Vegan brushes can take longer to get foamy than natural hair brushes as they are not porous and do not absorb any oils, allowing them to build up on the surface instead. Vegan brushes that have been used with creamy products may take several swirls/rinses before foam begins to form. Once they have fully lathered, they are free of all pigments and oils.