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Long term insecticide treating of outdoor clothing

No.1520053 ViewReplyOriginalReport
I'm treating my clothes with permethrin to kill all the ticks and mosquitos. All the sources I found say that diy-applied permethrin (with sprays or soaking) lasts 6 washings or 6 weeks. But they also mention that professionally treated clothing, like Insect Shield stuff, lasts 70 washes. How the hell do they do this? And how can I do it in my garage without paying them 10 bucks per sock?