That’s funny. I’ve noticed that I seem to get the same amount no matter how much I prep and clean or not. Wearing a fresh throw away coverall makes the biggest difference, I always spend a lot of time blowing off the panels and racks and using a tack rag. I’ve been spraying in a portable tent/canopy outside my garage. I’ve tried plastic on the floor and taped perimeter, etc, and also sprayed with one or both sides rolled up over the bare gravel drive. Odd, but I seem to end up with the same amount of trash in the paint with either situation.Believe it or not, the cleanest paint job I ever did was spraying a 28' camper outside. Two coats epoxy and two coats single stage, and there is almost no trash in it.