[911 tweaks]

Does anyone know what (chemical??) to use to remove the remaining dumb dumb from the joining surfaces when I removed the front fenders off a 83' 911 ?? I have scraped and scraped and the d dumb just keeps rolling along... I don't want to scratch the paint underneath if possible which will add more painting and such to repair.

Also, it appears that this was the first time these front fenders were removed and the slide on clips that allow the fender to be bolted to the body had clips on BOTH the fender AND the body of the car!! Is this correct or possibly an "SC" era thing?? I have removed fenders off of long hood cars and the clips were only on the fender...
(maybe a spacing trick to help set up the gap of fender to hood??)

Thanks!
Bob