How to clean dreamline classic stock?

Sort of a basic question I know, but what do you guys do/use to clean and protect walnut stocks. Ive only ever owned polymer/metal guns prior to this so I am unsure as to how to proceed. The stock on the dl classic looks like it has no finish on it at all. I was thinking about using a wood furniture product like orange glo or pledge orange oil. Would the lack of finish make it more susceptible to potentially warping or swelling?
 
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One of the best products to use. Rub it in-wipe off the excess.

Mike