cleaning old varnish from birds eggs

I have aquired a small (50)collection of British bird eggs. They are probably from the mid 1920s? The owner varnished them and the old varnish has now yellowed. How can I get rid of the varnish?
Thanks,
George

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Spray on paint stripper

then wipe off with a cotton ball.

cheese cloth

Same as above - but use cheesecloth or velvet as cotton and felt can stick readily to other surfaces and make for a nasty looking display piece.