I think most no scent clothes washes are also UV killers.

I think the more important thing is the scent killer clothing wash, ie eliminating scent from your hunting clothing.

I think if your clothing has UV dyed/brightened fabric, UV killer may help, but not by much.

I think UV killer works better to eliminate UV brightners in detergents with UV brighteners, you can check it with a black light.....but UV killer wont eliminate it if its in the original dye/fabric.

So use it none the less for the no scent properties, and if it helps with UV great.