Suzi, mine isn't very bright but you definitely got a smile out of me!
Gene, I never tried spraying for them because on my BT the ostioles are so big the beetles seem to just zip right inside without waiting around, so I figured it wouldn't do any good. Maybe it's worth a try, though--did you also spray fruit that you intend to eat? It seems that even if you used a non-toxic spray it would still spoil the taste, even if you did happen to end up with a brighter smile.