Get a box of Q-Tip style swabs and use them for cleaning hard-to-reach
places, such as the underside of playfield inserts, and the tight spaces
between playfield posts. Dip the swabs in rubbing alcohol to clean the
underside of playfield inserts and playfield cleaner for the playfield.
Rubbing Alcohol may leave a light white residue when dry. On white inserts
this is not a problem. However, you may want to use Novus #1 or #2
instead. Novus will not leave a residue.
Playfield inserts are those 1/2" to 1" or so little plastic lenses in the
playfield that lights shine through to indicate scoring and status.