Full Marks Solution In just a 10 minute treatment time, Full Marks Solution is clinically proven to kill head lice. It has no nasty smell and is suitable for asthma and eczema sufferers. Furthermore, Full Marks Solution does not contain traditional pesiticides. As a result, a second treatment is required after seven days, in order to kill any newly hatched head lice. A nit removal comb is also included in every pack. Ingredients Active ingredients: Cyclomethicone and Isopropyl Myristate. Directions Adults and children over 2 years: Apply to dry hair. Leave for 10 minutes. Comb through hair with comb provided to remove any lice and eggs that remain. Finally wash out the solution using non-conditioning shampoo. Children under 2 years: Not recommended. Suitable for people with asthma and eczema. Always read the label.