In reply to John.

It is impossible and unethical to determine a course of treatment for an object via a blog. Tape removal can be very tricky and its success depends on a lot of things including the type of adhesive and carrier that is present, the substrate and its condition, and the type and condition of any media that is affected. There are a variety of mechanical methods in addition to solvents that might be effective, but without seeing the object and evaluating is properly, it is impossible to recommend any particular action.

The best advice I can give you is to contact a professional conservator to have your object evaluated. The American Institute for Conservation has some excellent resources on their website on finding and working with conservators. Good luck!