The Brush Egg is compact, and effective. The smaller knobs on the top are used for foaming & lathering, the grooves on bottom are used to agitate the bristles to release the product, dirt, and oils. It also re-aligns the bristles without stripping them.. How to use:. 1. Place your fingers into the egg and rinse both brush and egg under water.. 2. Add shampoo/ fairy liquid to your egg and begin to gently swirl brush until the water is clear.. 3. Remove excess water from the brush, reshape and leave to dry.