Mr. Pinball Tip:

NEVER use an abrasive on solid state switch gold contacts. This will remove the gold, which is soft, and cause inevitable switch problems. The best way is to use a business card, or other stiff paper, and draw it through the switch with light pressure. For additional help you may use some rubbing alcohol or solid state contact cleaner on the card.

If for some reason you, or someone else goofed and filed away the gold plating on the contacts, you will need to replace the switch and contact points. These parts are easily available from most suppliers.
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