Try a good quality glass cleaner with ammonia. Just spray it on let set a minuteor two. Than gently wipe off with a paper towel. If stubborn you can lightlyscrub with a green scrungy. Hope this helps.
The easiest way is to get a blow-dryer, heat up the wax until it gets warm, and wipe the wet wax away with a towel of any sort. Paper towels are recommended.