STP & Hoppies #9
In gunsmithing school (CST 86-87) we would use 5 parts STP mixed with 1 part Hoppies #9, 1/2 to 1 part WD-40 (to thin it down). When I worked for a large firearms importer, we would go through gallons of it. Mil spec cosmoline is the best for long-term firearms storage (and cheep).
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