Last month we took our teardrop on a 10 day trip from Maryland to Florida. The second night in Florida the mosquitos came out pretty bad and 3 of them accompanied us into the teardrop at bedtime. We had to spend some time chasing them around with a fly swatter before we could get to sleep.
I just happened to have a can of permethrin in the tonguebox so the next day I sprayed the teardrop curtains and bedspread with it. It is not only a repellant but actually kills them if they land on it. We had no more problems with mosquitos in the teardrop for the rest of the trip.
This is meant to be used on fabrics, not on skin, so do not spray it on yourself. You spray it on and let it dry. They say it will last through a couple of washings but I intend to retreat my linens after washing just to make sure.