Get Your Own Pressure Washer
Even though you share a fence with your neighbor doesn’t mean it’s your responsibility to clean both sides. This person pressure-washed their gate to absolute spotlessness, while the neighbor’s side was left with caked-on stains. If you want to clean your wall, get your own pressure washer.
Though to be fair, both neighbors probably know about this unwritten rule. No one expects you to go the extra mile to make your neighbor’s property sparkle, and it would be unreasonable to think so. If anything, the neighbor should use this as motivation to get a pressure washer. You’ll find a million and one different uses for it when you finally own one.