Debris clinging to lower buds - caterpillar poop or dust?

looks like your growing it outside, shit will boe aorund and get caught in the sticky icky of the buds. Its why Bud washing outdoor grown is a good Idea. Gets rid of some of the nasties it collects. I would not assume it is caterpillar poop unless the plant has caterpillar eating it. They don't tend to toss there shit in the air and let the wind take it, and even if they did. its not light or aerodynamic to get far. max 2inch from their current location. prob just bits of dirt blowen up in a storm and from other bugs carrying it over to places. Bees, flys, butterfly, birds, humans, stupid children of humans. exct. Nothing to worry about IMO. Might be getting to much N though. Just looking at pics but could be the lighting.