best cover scent= butchering chickens in hunting clothes.. the water you boil the chickens in soaks into the clothes and you smell awful for days but so far the deer haven't winded me. Even the buck I shot straight downwind of me didn't have a clue. I've had deer with their noses up trying to wind me but they can't figure it out and keep coming
Another great cover scent is corn dust! I leveled bins one morning after hunting and didn't have a chance to change, I shot my buck the next time out and hadn't washed my clothes yet. Probably just coincidence but still!