Apply Natural look Pyrethrum Leave-In Conditioner following the cleansing of your hair with Pyrethrum Shampoo. Spray thoroughly into the hair and use a fine tooth comb - starting from the back of the head - and take your time to ensure the removal of all nits (eggs). Pyrethrum Leave-In Conditioner can be sprayed onto dry hair daily and used by all the family to prevent further re-infestation.