Noise Complaint against City

I live two blocks from city hall and they violate our code ordinance by pressure washing the streets in the middle of this night. They have an activity exception which they were claiming this is. Now they just say they don’t have to follow their own laws. I need some research in preparation for taking on city hall. PS I have this in writing from the City Atty I’m on phone can’t upload everything City is West Palm Beach and related is dumping billions into our city. This Fee offer is just to get started. There can be more if we find substance and can validate the argument.