Did you at least put on some gloves and safety glasses before you turned your living room into an episode of CSI? Because that is exactly how these things go, you buy a cheap tool to solve one small problem and end up with ten new ones. In my experience the pee spot is usually still glowing a weird yellow green while every other stain just looks like a faint blur, so maybe wait until dark and check it from a few feet back. Your mileage may vary on that trick but it saved me from scrubbing half my kitchen for no reason. Worst part is now you know too much about that wall and you can never unsee it.

The part about him waving at you while you stood there in wet socks is what got me. He waved. Like you two are in some kind of club together. That is not a wave situation. That is a "sorry I ruined your morning" situation, and he skipped right past it. A leaf blower at 7am on a Saturday should be against the law in every state. At least the cat knows it did wrong, which is more than the neighbor can say. I would take the cat for a month, no question.