Plastic wrap should never be used in ovens, grills or other high-heat appliances because it can melt. Foods high in fat or sugar heat quickly, which can cause plastic wrap to melt or leach chemicals.

Both glass and plastic Pyrex lids are microwave-safe, though plastic lids should always be vented to prevent pressure buildup. Glass lids are usually dishwasher safe, but plastic lids may warp or ...