Avalon Acoustics encourages their owners to use Stewart McDonald Preservation Polish (stewmac.com). Whatever you use, stay away from silicone based products.
How about renaissance wax. This is what museums use for their priceless collections. Expensive, but a little bit goes a long way. Found at high end woodworking stores like Woodcraft and Rockler to name a couple.
See what Dynaudio recommends. Chayro is right, you are probably working on the poly finish, not the wood. Be careful, good intentions on this can lead to unfortunate results.
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