Try picking up some isopropyl alcohol (91%) at the pharmacy/store. Clean with a Q-tip or tissue/napkin wetted with the alcohol. Don't forget the atty/carto
threads too.
It will evaporate away cleanly leaving no residue. While you're at it... if you have a cordless phone that sits in a charger base... clean the contacts on the base/phone too while you have the stuff out.
