I'm always amused when these "Ghost Hunters" set up a camera with its own light source, which is much like the built-in IR illuminators in a security camera. Or they shoot stills with a small "point and shoot" digital camera whose flash is also very near its lens. And then they act surprised when they see reflections from dust near to the camera. They always make these floating dust specks out to be "orbs", presumably some sort of spirits or ghosts.
When I die, I don't want to come back as a tiny speck of dust! I want to be able to do some serious haunting, darn it!
We get a lot of wind here, and it's pretty dry most of the time. So blowing dust is almost ever-present. The built-in IR illuminators on security cameras give us a constant light show. Until I started using
Blue Iris and could set the minimum size for object detection, the motion-triggered recording built into some of my cheesier cameras was more or less constant.
With spider webs and bullet cams, they string the webs from the "hood" down to the bottom or side of the camera body, and then it moves with the breezes and also sets off the motion detection more or less continuously.
As nice as some of the bullet style cameras are, I don't think I'll ever buy one again, and if I do, I'll take it apart and use a band saw to remove the overhanging hood.
And I may well try some of the insecticides that you guys have recommended. That might provide a lot of relief!