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Old November 13, 2012, 07:08 PM   #20
Dfariswheel
Senior Member
 
Join Date: May 4, 2001
Posts: 6,830
GI Maintenance manuals show using a worn bore brush to clean the gas key by putting the brush on a GI cleaning rod section and pushing and twisting it in the key.

You can do a better job of cleaning the key by using Slip 2000 Carbon Killer.
It gets all the way inside the key passage where the brush can't reach.
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