Start treatment immediately. In order to get best results, it is important to conduct the treatment simultaneously in all persons in the immediate environment, who might have come into contact with the parasites. Apartments should be thoroughly cleaned, since lice can survive off human scalp for even two days – on bed linen, blankets, clothing, upholstered furniture. The items that cannot be washed should be tightly closed in plastic bags for several days, as nits can survive even up to two weeks off the host. Therefore, the places where hair of an infested person can be present, like carpets, armchairs, sofas and even car upholstery must be thoroughly vacuumed. All hair toiletries (brushes, combs, hair elastics, etc.) should be discarded and new ones should be bought.