I wash it every time I use it. And I am sureI've been busted not having clean clothes on. Wednesday after work I went to the lease to hog hunt. I got winded from 90yds away by a big boar. The winds were swirling and he was headed towards me. He suddenly stopped like he hit a brick wall, turned around and ran 15 yds and stopped. While he stood there looking for the cause of the smell I dropped him. I was hunting with my ML that day. I had sprayed down before leaving my truck but it was not enough to overcome all the odor on my work clothes.