Thanks for all the tips..she basically spot cleaned...she didn't rub it all over the headlight just on a quarter sized spot so therefore that quarter sized area is a bit cloudy now. I guess before we purchase new headlights, the fine grit sandpaper is worth a shot. Maybe it didn't get too deep into the plastic after all.
Acetone really burrows into the plastic, it literally liquefies the plastic and rapidly solidifies as the acetone evaporates. You may be well advised to leave it as is.