From Wahl Professional’s line of products, the ’19 Premixed Liquid Lather is intended for professional use only with the Wahl ’19 Liquid Lather Machine. Wahl’s ’19 Premixed Liquid Lather solution is ready-to-go right out of the bottle, simply pour in, heat up, and you are ready to go! Wahl's lather contains vitamin E to soothe the skin, making it suitable and beneficial for sensitive skin types. To use Wahl Professional ’19 Premixed Liquid Lather, remove the lid of your Wahl ’19 Liquid Lather Machine, take out the retaining bottle, and unscrew the pump. Fill bottle up to (but not past) the fill line with liquid lather. Allow to heat for 50 minutes for optimal use.