Car wax for your stove? The September 2007 issue of Real Simple offers this tip from their "new uses for old things" column, using car wax to help keep your stove top clean. They suggest before you cook, to apply a layer of wax to the enamel surface with a soft rag, then wipe off. "The thin layer that remains will prevent greasy splatters and spills from sticking." Cleaning up afterwards will be very easy. Has anyone tried this before?