Well, I think they do to an extent. I do not believe though that any scent killer product can truly get rid of all human scent. A little cover scent, and using the wind to your advantage, and I think you are fine. Heck, I have even used diluted apple cider on occasion when hunting in an apple orchard, or if I forgot that, I would take an apple andcut it open, then rub it on my hat, shoulders, pants, etc. Seemed to work for me. Heck, no deer that is downwind of you in 20 mph winds is gonna stick around too long, scent killer or not.
I always shower with scent killer body wash, use scent killer and a cover scent and then hunt downwind of the deer. Does the scent killer work? Dunno for sure, but the entire program seems to do the job.
Want a quick and inexpensive call for Moose? Take an empty 32 ounce coffee can, and make a small slit in the bottom, only about a quarter inch. Then, take one of those really big red rubber bands, the ones that go around big folders. Cut the rubber band to make one long piece.
Now, thread one end of the band and tie a knot on the outside of the can so it won't pull through. Cut the band off on the other side so it is even with the top of the can.
Now, wet your finger,...