Tar removal
Any of those should work. WD-40 should also work. If you arenot interestred in saving the powder or primers a 50/50 solution of Dawn soap and water should also work and would be alot safer although it will reguire a little more elbow grease. A few yrs ago I was doing some experiments to test Rig Washes, using a 17.5 ppg Oil mud. On a lark I tried a 1% Dawn solution and it was as good as any of the rig wash samples.
Bob
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