I've used Scent Shield for years with good success. But I also do all the little things that go along with it like keeping my stuff clean and odor free in garbage bags, suiting up when I get to my hunting area, not wearing my boots when gassing up the truck, ect., ect. Can I say that scent eliminator is the reason for success? Of course not. It's the culmination of all the little things that I find makes the difference. Then there's all the things you need to do once you get to your spot. Your set up, the wind, a little cover scent by my stand or set up and so on and so on. Almost nothing is foolproof, well except for death and taxes anyway. Guess that's why it's called hunting and not killing. Typically I'll do whatever I think will increase my odds to be successful afield. JMO
I will say this, I agree with everyone about a canines sense of smell. Drug and bomb sniffing dogs, avalanche dogs, cadaver dogs, heck exterminaters are using dogs to locate termites in houses, and my buddy Murphy.........., that son of a gun could find a fart in a snowstorm. That said I still think that every little thing you can do will increase you chances of success like using a good scent eliminator that contains chlorophyl. Again, JMO.
I always get a chuckle (take deer hunters for example) looking at guys all suited up having breakfast in a smoke filled diner or gassing up their vehicle before getting out to their hunting spot. Smelling like bacon and eggs, gasoline, or underarm deoderant just isn't a recipe for success in my book.