Hey Marc
Theres no built in method of doing this that i know of. But i have had luck in the past using the following technique, although it’ll depend a lot on your footage.
You start by generating a black and white luma matte of the scene, where the small objects are white. Usually just by Tint and then levels adjustments. Then you can try to apply blurs to the luma matte layer and tweak the color levels of it with the levels or curves effects. The idea being that between the blurs and level changes the small objects will get blacked out and thus become invisible.
Doesn’t always work but worth a shot. You might have to make a garbage matte over the subject of your shot so the edges don’t get eroded. You can also try other effects on the matte like chokers to expand the matte enough to block out the tiny objects.