Hedrin Treat & Go Spray is the easy, no-fuss way to get rid of head lice and their eggs. It's a light, non-sticky spray which spreads quickly and easily on the hair. It has no nasty smells, is skin friendly and contains no known asthma triggers. It can be Apply straight onto dry hair then everyone's free to get on with their day. Leave it in at night if you like. The lotion needs to stay on for at least 8 hours. Rinse or shampoo it out, you'll find it comes out really easily, and the dead lice wash out too.