We have an older log cabin that we use as our hunting lodge. It was actually a Civil War slave cabin from a plantation that was disassembled and reassembled on another site. The logs are quite old as one would suspect, however, in great shape. Our concern is how to clean/restore the interior. The logs have ”greyed” over the many years. When the cabin was reassembled, proper chinking was not used. Is it possible to sand/media blast the interior? Would you then seal the interor of the logs? It see