I did a cook a while back and didn't clean up afterwards. About a week ago I opened my WSM 18.5 and there was mold on the grates and on the interior sides. I fired it up with charcoal as hot as I could get it to try and disinfect. Do I now need to scrub the interior walls? I know typically you don't clean those but don't I need to after there was mold on the inside?