Quoted from reynolds531:Buy a good can of carnuba wax. Give that playfield a nice rub down.
What is wrong with the pinballs that Stern ships? I have a NIB AC-DC and LOTR and the balls seemed ok.
There's nothing wrong with them but you have to put balls in anyway so I always reach for premium balls versus the balls they ship with. The balls they ship with, when compared to premium balls, look dull and pitted. For $10 I prefer to go premium.
Heres a good post about them...
https://pinside.com/pinball/forum/topic/balls-premium-comparison