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Old July 9, 2013, 10:56 AM   #6
wogpotter
Senior Member
 
Join Date: September 27, 2004
Posts: 3,452
Don't use "sandpaper" to clean contacts. Its way way too abrasive & will rip any plating off in a heartbeat!
An ink eraser on a ballpoint pen is as harsh as you'll ever want to go. Also a thin smear of petroleum jelly (Vaselene) will protect previously damaged contacts while allowing electricity from the battery to pass through.
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