Originally Posted by Amri215
What bad advice being given here..do not "gauge" at the holes with any tools. Try washing and spraying with a hose
What he said.
Just a hose or compressed air works. The dust doesn't fuse itself in. It's relatively easy to remove and comes off with gentle force. If you wash your car yourself, just aim the water on each hole directly and the dust breaks free and your done. Proceed with the rest of the car.