RE: scent killer or cover scent.....
Wash your clothes in baking soda or a non-scented wash. Use scent shield or any of the million other sprays. I personally like white lightning and regular scent shield. I have used earth scent wafers, but I'm still 50-50 whether they help. I have no proof of being busted using them, but I really like the idea of as little scent as possible.