I just spent 13 days elk hunting , killing a nice bull on the next to the last day of the hunt. I spent a good amount of time washing my clothes in scent free detergent, using scent free soap, taking a shower every morning. I also used every kind of scent killer known to man . I hung my clothes out in the fresh air a good ways from camp. Even with doing all of this there were several times I was busted after a shift in the wind. There is no question that elk have a great sense of smell. That being said, there are times when you can work with the wind if it happens to be blowing parallel to the animal you are after. If you are lucky it will blow by without them detecting you. More often than not you are wasting your time hunting with the wind at your back.