Hi.Well there's a huge dispute as to the validity of the sprays and certainly as to the carbon suits etc.Visit any of the major archery websites,do a search,and you'd be overwhelmed.Want to start an argument?Thats the topic to trip triggers.
I don't argue about any of it anymore but here are my thoughts re coyotes:
You have to use the wind.Their noses are exceptional but also with guns and other repeatedly used gear,in/out of vehicles with your clothes/boots etc its impossible to 'keep clean'.You simply can't take the care or steps to try stay 'clean'that you can deer hunting or whatever.
If you want to use the 'sprays',keep in mind the whole industry started with cat piss odor remover-following that lead a bit or going to the archery sites and searching again will allow you to buy it in bulk or make/mix up your own cheap.The formulas are out there.
All this is not to say I'm not conscious of it,I try to minimize odor of all sorts on my gear and my coyote clothing hangs outside like my archery gear but I'm also not kidding myself.My dogs always remind me,I stink!Try to hide from yours-they'll make you every time if they are downwind.Heck,many times I've tried to deceive them and can't.Here's a simple test if you're an archer.Spray yourself,your bow,your hands/gloves and soak your arrow with any or all of the sprays.Now shoot it into some grass.Will guarantee my dog will find it.And then you'll know a coyote sure would.
I'll quit,just my 2 cents,and no argument intended or wanted.Good hunting!