burner rings!!!
Fred, dont be afraid to spray them with oven cleaner,just take paper towels and put between unit and drip pan, then take a paper towell and lay over burner, spray GENTLY at close range so you dont get it everywhere,let it set overnite,then wipe everything off with towels spray with windex to get off residue, if you get a lot of spray on the unit itself,it will turn white when heated,if that happens, wad up some waxed paper and go over the hot unit, oh yeah, dont use that worthless fume free stuff,if it doesen't have lye it just wont clean...Hans