been there many tmes with my niece. Igot hold of some strong chemical's and made them all leave their trailer for a full day sealed it up and more less bombed the entire place. it killed the lice,eggs, and many other critters that were comingg in from outside.(heck even critters under the trailer )which led to us finding a few mice holes into the trailer. My niece had her hair washed so often from the lice shampoo that she had some minor chemical burns.. (They found out her so called best friend was the carrier and was getting reinfested everytime she was visiting her father on weekends)