If these were mine, even if they were inherited and I wanted to keep them forever, I'd find Dick Towle (who sometimes posts on here) and have him work his magic.
You can read about him here:
http://www.sportscollectorsdigest.co...res/nerattowle
And I am sure you can find him by searching on here.
I once had an SGC 80 T206 Donlin batting that came from an album in which it had been glued/pasted. Towle was responsible for removing it, SGC didn't care, the card was no worse for the wear. Everyone was happy.
You'll find a lot of purists who want to preserve muck, grime and glue on baseball cards. But if you can remove the excess gunk without jeopardizing the fibers of the card with harmful chemicals, in a manner that is wholly undetectable for now and forever, then I say go for it.
You should at least be aware of this as an option. Whatever you choose to do.