Ammonia - Never heard tell of it?? You never know until you try it.

You might wanna try this "Cheap scent idea",
Buy a bag of apples(MacIntosh(sp)has best scent,2-3 bucks bag).Every time you go out,put 1-2 apples on ground,crush it with boots,rub it all over soles,sides etc.Rub it on pant legs.
I've had everything from deer,rabbit,fox,possum,tree rats,hogs follow my path directly to stand.No matter where you hunt animals love apples.