Schatzie, you are not alone! I didn't use the blacklight but about two months ago we replaced our carpet. Seeing the underneath of the old one was the most SHOCKING thing I've ever seen. I was thoroughly disgusted to find out EXACTLY where Macey was peeing when we weren't looking!
I can't believe I was walking around on that. That's why we got a spotbot the day after Lilah came home. I even asked for one for my birthday, so I can have one in my apartment
I'm also going to look into the products mentioned on this thread.