David:
What you must first understand is that you will spend much more money/time/effort on this gun than it will ever be worth. In plain language, you will take a bath.
That said, any attempts at cleaning or "restoration" should be preceded by a complete disassembly and inspection by a competent double gun gunsmith. Chances are the stock of this gun is in very bad shape and may not be salvageable. But be prepared to pay for such an inspection. Then be prepared for financial heartbreak.
However... there is a certain sense of salvation in bringing a beater back to life. So go what your heart - and wallet - take you.
Sorry to be so deflating, but it's better that you understand the truth now... rather than later.
Best, Kensal
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