Try not to use lice killers - some contain a chemical which can sriouly affect vision. Instead use Shikakai soap or Neem (Margosa) water.

Note: Some people benefit by applying lemon juice or sesame oil to the scalp before washing. Avoid harsh shampoos - some anti-dandruff shampoos can cause damage internally due to the ingredients that go into them e.g. tar. We find Fuller's Earth (Multani Mitti) and/or Shikakai nut powder (also known as soap nut powder) are good substitutes for shampoos especially if you are the kind that wants to wash frequently.