Mr. Pinball Tip: 
Oxidized bulb sockets can be easily, quickly and thoroughly cleaned. As this is a chemical problem I use a chemical solution to this. 
Create a vinegar-salt solution--Dissolve as much salt (sodium chloride) in vinegar until some salt remains on the bottom. 
Create a separate baking soda solution--Dissolve 15 grams backing soda (Sodium bicarbonate) in 150 ml of distilled water. 
Put the sockets in this vinegar-salt solution. 
Stop the process by putting the sockets in the baking soda solution. 
Rinse thoroughly in distilled water. 
Finally, spray them with silicone spray and wipe off excess with a soft cloth. 
 
This also works on other non-ferrous metals.
 Noel Ramakers 
noel.ramakers@gmail.com 
 
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