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Friday 22 December 2017 at 17:41
Quoted from RacingPin:The owner says they can be wiped off and put in a museum.
Make sure to wipe them front to back.
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Source: http://pinside.com/pinball/forum/topic/so-im-working-a-deal-for-these-10-em-machines-but/page/2#post-4137330