They had a special on Deer and Deer Hunting TV about this topic. It seems that all clothes are dipped in a dye that makes the colors stand out to us. However deer see UV light much easier than we do. I have never used the UV killers before, just scent soap, plastic bags, etc, but I will spray with UV killer before this season.

If I spend $10 and it only gets me one extra mature buck than its worth the money.

All hogwash to get your money! Deer have been hunted and taken for hundreds of years without this crap.

And without camo, tree stands, calls, high-end compound bows, drop away rests, carbon arrows, scents, etc., the list goes on.
I have no idea if the UV stuff works or not, don't pay any attention to it, but many of the other things we use these days are no more important/valuable than it is. I guess it's in the eye of the person shelling out their hard earned $$$.

I have buddy's who have killed deer while smokin a cig and in their trucks. And yes you might get lucky and have the wind and cover all be right and kill the next world record.

But, anybody who has spent enough time observing pressured deer, knows that deer have a good sense of smell, sight, and hearing. To consistently kill mature bucks, you have to go to difficult lengths, that means watching your scent, blending with your terrain, and being quiet.

Nearly all of the camo in the stores today has been treated with UV brighteners to make it more appealing to our eyes when we shop, Atsko UV Killer definitely works as advertised.

Right On!....................Also washing your clothes in commercial detergents will highly enhance the UV's to make them look cleaner!