I've been using a food grade mineral oil -- the same stuff I use on maple block surfaces -- very effective, safe and non-toxic when lips are pressed against the speakers.
The only thing I would caution is when dealing with veneer. Too much solvent based or even oil based treatment can damage the adhesive and cause the veneer to seperate from the cabinate. Fortunately this occured when trying to revive a worthless old table. Use enough, not too much.
I'm using a "mini-Statement" ("Comment"?) system. ML CLS 1's with Kinergetics SW800 sub towers. Yeah, I love these speakers so much that I get a little kinky with them late at night. Hence... the non-toxic oil ;-)
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