How do you proplerly apply these permethrin pesticides, I know its frowned upon by many to use them but if you do use them how do you apply them. Do you apply permethrin during the evening till overnight? I hear some people say leave on 12 hours some 14 hours, some are leaving it on for 24 hours. Some are using creams, some are using lotions, they should really make things more clear for people who are suffereing from scabies...