http://bit.ly/18ICIXf

Permethrin is used on humans to eradicate parasites such as head lice or mites responsible for scabies and as a pest-repellent clothing treatment.

In order to better protect soldiers from the risk and annoyance of biting insects, the US[8] and British[citation needed] armies are treating all new uniforms with permethrin.

看 Wiki 上寫的，百滅寧的確有用在衣服上來驅蟲和塵蟎。
美軍英軍的新制服都有用。
只是不知安全劑量是多少。