One of the reasons I soak my clothes is that it is MUCH cheaper to DILUTE a stronger concentration of Permethrin down to the percentage needed for treating clothes.
This link shows you the amount you need per gallon of treatment based on 2 different solutions of Permethrin.
(You need to Login or Register to view media files and links) I used the 36.8% formula. I got in on AMAZON.
(You need to Login or Register to view media files and links) 32oz diluted in 18 gallons (large washer load)
enabled me to treat ALL my clothes far cheaper than using spray bottles.
Soaked clothes overnight, put on SPIN cycle a couple of times to get all the water out, then dried on LOW heat in the dryer.
Permethrin is ONLY toxic to cats when it's WET.
Once your clothes are dry kitty is safe.
I've always had a cat until this year and have soaked my clothes since I read about the treatment.
However, you decide to do it, it works to keep the bugs away.