Neighbor sprayed substance on front of my car/me when getting out of car

My bizarre neighbor harassed me yet again today by spraying a bizarre substance on the front of my car and on me while I was getting out of my car. Of course he did it not in the view of my camera. I immediately took a shower but I don’t know why anyone would this.

It looked like water or a pesticide. I’ve caught him spraying my bedroom windows before but that was with water for sure I think