Shake bottle well.
You must apply solution to dry hair.
Cover shoulders with old towel. Comb hair thoroughly.
Ensure hair is as tangle free as possible.
Avoiding contact with eyes, saturate scalp and roots with solution. Comb through the hair, using wider side of fine tooth comb first, then repeating with the finer side. Remove any lice which have been caught in the comb (an old toothbrush or toothpick works well).
Leave on for a minimum of 20 minutes, combing frequently with the nit comb for maximum benefit.
If preferred, the solution can be left on overnight.
Before washing out, comb again with the nit comb from the roots right down to the ends (as described above).
Wash out with a normal shampoo, rinse and shampoo again.
Dry as normal.