These come in handy (link provided below) for scraping hardened rubber or crud off of painted surface with minimal abrasion or damage to surrounding finish. They come in handy in many ways during the restoration process. In the past, I cut the rubber extensions off of stem bumpers ordered from Mcmaster Carr and used for Westinghouse tank feet and glued them in place. There are other options you can dig up similar that will do the job.
Fiberglass Solder Aid and Spudger Probe (specialized.net)