Sometime in the early 1970s my mother got Rocky Mountain Spotted Fever. She was quit ill. From the pictures she send me ( I was in Hawaii) she looked like she had been beaten from head to toe with a meat tenderizing hammer, and she said the doctors told her that her internal organs would have also been covered with the same rash. I had only heard of RMSF about a year earlier when I was at Bainbridge Naval Training Center in Maryland.
Treating your clothing with Permethrin is said to be quite effective against ticks, fleas, and mosquitoes .
You can also spray it on your hammock, tents, bug screening, etc. I have read it is also highly recommended to retreat often your shoes and socks as that is frequently the route ticks take to climb aboard you. Permethrin can be applied by spraying it on or by a soaking method.
According to this post on Section Hiker, self Permethrin treatment last through about 6 weeks of weekly washing of your clothing.
A couple of days ago I watched a YouTube video of someone going over their gear list for a planned through hike of the Appalachian Trail. They mentioned that they sent their clothing off to be treated with Permethrin. I had not heard of this before, and they did not say where they send their clothing to be treated.
A google search turned up Insect Shield in Greensboro, N.C. The claim on their website is that they have a process that more permanently bonds the Permethrin to your clothing. The research was undertaken at the request of the US Military, and the treatment will remain effective through 70 washings of the clothing. That is approximately 1.5 years.
I’ve no experience with them. Their prices seem cost effective. $8.33 for 3 - 19 items. Though it is unclear to me if that is the price for 19 items or the price for each item. But probably worth the cost if the treatment is as durable as their claim. Worth checking out, imo.