I have been combing ds1 hair every 2 days, then treating every 4 days with the shampoo. I do the other kids and my hair once every 4-7 days. They don't have it, just DS1. I was the sheets weekly anyway, so I have just been hot-washing them and adding tea tree. Plus I spray the kids heads with the tea tree every day. I don't know what else to do. If it's not gone by Monday, I'm shaving his head. Luckily for us he's not scared of the clippers any more!