I have a 1904 Prairie Style/ Arts & Crafts home that has quarter sawn oak woodwork. The condition of the finish needs to be addressed. The outermost layer has taken on an alligator texture. I hesitate to use an aggressive chemical stripper since the patina of the wood could be compromised and I don't necessarilly need to lighten the color. I would like to find a technique to remove the outer layer of varnish, clean it up and apply something such as tung oil. I don't believe that the old finish is shellac since denatured alcohol doesn't seem to remove it. Any ideas? Thanks for your help.