Can acetone be used on electronics?
you never use acetone on a pc board unless you are stripping the top coatings off (copper lacquer (usually green) and component screen print). You can always use a pencil erasure on touchups. If you don't have any no wash items installed (pc mount speakers, non hermetically sealed contact relays, etc) you could just throw the board in the top rack of a dishwasher to clean it. Back when I worked at SCI we stuffed boards surface mount and wash pin and hole items (connectors) flow solder them, then washed them (on a glorified dishwasher on a conveyor belt)  then stuffed the no wash items in then spot clean with a alcohol pad (maybe, depend on who and what we were building).