A necessary part to any gas grill is the grease drip cup. A drip cup usually is located beneath the grease tray on a gas grill, and it functions as a device to catch excess grease drippings while you cook. Without one, the surface of your patio or deck becomes stained and an attraction to bugs. If your grill doesn’t have a grease trap, and you’re grilling something with a lot of fat, place a disposable pie tin or a homemade one made from heavy-duty foil, on top of an unlit burner under the grates to catch the drippings.