I don't buy into any of the hype. Between hunting experience, and professional knowledge as a chemical engineer that's done some work in that area, I really just don't buy it. All of it sounds great in theory, but the PRACTICAL advantage is moot.
Scent killer: anything that would ACTUALLY capture your scent would be consumed within minutes of application.
Scent Cover: Polish a turd, all you have is a purty turd.
Ever have a roommate in college that would go work out, then go on a date without showering, and just rub on fresh deodorant and spray down with cologne? That's how I feel about scent cover and scent killer. Yeah, you'll smell the cologne, but it smells like a smelly guy covered in cologne.
As far as the UV "glow" goes, if you use the RIGHT amount of detergent (about 1/3-1/2 of the recommended amount), and your washer drain isn't plugged, and you don't hunt under blacklight, you will NEVER glow.
The advertisements look very dramatic, when they show "ours vs. theirs" under blacklight, but remember, that's under HIGH INTENSITY UV WITH NO OTHER LIGHT SOURCE. With ambient UV under natural lighting conditions, i.e. the UV intensity is no greater than that of the other light frequencies.
Think about how blacklight/UV illumination happens on those CSI shows, or for your hippy roommate in college. When the lights are on, everything looks normal, but when you shut off the lights, the UV "reactive" stuff really shines. Under balanced light intensity, you won't notice anything, it's only when the UV intensity is overpowering the broadspectrum light frequencies that you will see a glow.
In layman's terms, no you WILL NOT GLOW to a coyote.