By far the most effective and cost efficient method that absolutely works is activated carbon, you can buy it in 1 lb mesh bags for about $2 bucks, I just ordered 6 bags off ebay for $12 with free shipping. I keep one or 2 in all my totes and every piece of hunting equipment/apparel I use stays in those totes. I also keep one in the bottom of my back pack. I still use sprays on my boots and stuff, but the carbon is the way to go. Oh, I also keep a bag in my bow and gun cases.