Strange gunk/wax on WM-F28

Just picked this up off eBay. Listed as problems with volume and radio tuning. It has the other problems too, belts/rollers etc. while taking apart I noticed half the board looked oily, and dull. When I get to the radio tuning controller, I see all this crap around it. Looks like something melted/leaked in there or something. I'm baffled, not seen anything like this before. A gone else? Not sure if I should even attempt cleaning or if something beyond repair.