Not supposed to be anything in there, I used a dentists dental pick to scrape mine out. The dentist throws those away so ask if you can have yours when you go. Anything you try to fill it with will eventually fail and crack the paint.
1953 Chevrolet 3600 Fried Green T'mater (Vern) In the Stovebolt Gallery Caution: Political Statement Man who runs in front of car gets tired, man who runs behind car gets exhausted.