1. The product is applied to dry hair. Spray well the roots of the hair with NYDA®.
2. Apply NYDA® by massaging and leave it on for 30 minutes. The package insert gives detailed instructions on how to do this.
3. After 30 minutes you can carefully comb the hair and remove dead lice and larvae.
4. After 30 minutes, you can wash your hair and rinse NYDA® with your usual shampoo.