I just came into a Sako AV in 25-06. The 595,xxx serial number puts it at about 1987 manufacture. The previous owner applied some sort of coating or other product to the stock, which has now turned into a cloudy residue. I would like to clean this residue off the stock, but don't want to harm the underlying factory finish. Anyone know what was the stock finishing material Sako used during this era, or could otherwise recommend a cleaning product that won't hurt the Sako finish used during this time period?