I used to buy Sawyers Permithrin to treat my clothes with, but a buddy shared his recipe to make my own!!!
Here's the Sawyers bottle I mix in...
And here's the concentrate that you can find at your local pet supply store!!
Use 1 oz of the Sentry 35 day flea dip for dogs to 12 oz of water!!! I've done this for the last 2 years, from spring turkeys to camping in the woods at civil war reenactment a to early season bowhunts, and it works!!!
Permithrin is to treat your clothes, do not spray it on your skin!!!
I also spray my dog with the same mix from time to time!!!