Pro tip: Keep the chips away from the game board unless you want a greasy mess
I hosted a game night and someone brought oily potato chips. Now my favorite board has permanent fingerprints all over it. Never letting that happen again.
Really, is it that big of a deal? Board games get worn out from use all the time. Those greasy marks probably just show it was a fun night. I doubt the board is ruined for good. A quick clean might fix it, or just accept it as part of the game's story.
Spilled soda all over my Monopoly board once. Now every game night, someone mentions it. xena767 has a point, those stains just add to the fun memories.
On my old Scrabble board, some stains seemed set but faded after a while. Most grease marks wipe off with a damp cloth if you catch them early. It's not worth losing sleep over a few spots.