While I believe that deer see UV differently than we do, I think the whole "U.V. Killer" thing is over-hyped. They still have to have reason to relate the so called "U.V. Glow" to danger. I've been down at the cabin after my wife did regular laundry and hung it out on the line, only to have deer walk by and feed on the apples on the ground next to them. Not only did the detergent have U.V. brighteners in it, it also was heavily scented. My guess is, that at some point, relatively recently, something in that spot previously spooked the deer. Thus, their focus on that spot, plus something different, put them on guard. The U.V. brighteners may have contributed, but without movement, I have a hard time thinking it is the primary reason. Sometimes, even the most popular camo patterns to us, are not the best camo for deer. Many times the intricate patterns that catch our eyes, look like a huge blob out of place from the surrounding terrain. Thus, to an animal already alert to a spot from a previous experience, will feel threatened when they see a blob in the same spot. I use detergents specifically designed for hunting clothes not only because they lack U.V. brighteners, but because they are also scentless and/or scent killing.
Few years back, I had deer starting to pick me out immediately in a tree stand that had previously always been very productive. This was from all the way across the field. They would take one look and go the other way. Finally gave up on it. One day I went down during the week instead on the weekend only to find the neighbor kid sitting in it. By the time I got to it he was already gone, but it was pretty evident to me why the deer were spooked to it, even tho I had not over hunted it myself much. Later on the kid admitted he had been sitting in it during the week when he knew we weren't going to be around.