Mr. Huddleston,
If the shineness is a result of the oil that you put on the stock, then it is not of as much of a concern. What should be cleaned off is whatever is on the metal parts that are giving it that yellow look. Most likely varnish or shellac which will be removed with denatured alcohol. You want to go slow and be careful. Denatured alcohol will remove shellac from the wood too, and that is what most of these original finishes are. So you don't want to get it on the wood.
Denatured alcohol will soften the shellac first and then with continuous rubbing will remove it.
For example with old wood furnature, when shellac finishes shrink and crack with that crazed look. The alcohol will remove that worn out surface shellac so that fresh shellac can then be added.
OR that yellowing could just be dried oil. Some gun oils will gum up over time like this.
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B. Dudley
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