Stern Pinball playfield pictures
This game cleaned up very well.  It's amazing what new bulbs can do, especially when the old ones were all burned out.  This game has 4 orange roll over targets common to the earliest Stern games. 
Note the primary tones and colors in the game, which are rather common in 1970s and earlier electromechanical games.  Of course this game has an EM counterpart as well.
This game is missing the well known classic S spinner common to old Stern.  It was not designed and used until 1978.
The wonderful Mr. Clean Magic Eraser (TM)

Cutting up a magic eraser into rectangular pads and using them with a little alcohol on your playfield can have some amazing results.  This is used to remove ball swirls and other playfield markups that come from years of use.

Caution: Rub softly in circles.  If you do it too hard, it will take the finish off.  You may want to practice in an inconspicuous place first.  Also don't allow the playfield to stay wet too long, even with alcohol.
Before and after using magic eraser (carefully)