I took six pieces of 300 BLK brass that was tossed into the recycler and carried out a carbon removal test. All pieces still had a primer.
I filled a piece of brass with the following cleaners and allowed them to sit for 20 minutes before dumping the contents down the drain.
X-Treme Copper Killer
Sweets 7.62
Butches Bore Shine
Hoppe's
WipeOut
CLR
I know some are not carbon cleaners, but I was surprised by the results.
After draining each case, I took a Q-tip and brushed the inside of the case to try and get it as clean as I could.
In first place.... CLR. Every speck of carbon had come out. Even looked like the primer was clean.
Second. Sweets
Third. Butches
Fourth. X-Treme
Fifth. Wipe Out.
Sixth. Hoppe's.
Picture of the CLR case.

I did this to learn what removes carbon the best for future use in a barrel. I am NOT cleaning brass cases with this!
I filled a piece of brass with the following cleaners and allowed them to sit for 20 minutes before dumping the contents down the drain.
X-Treme Copper Killer
Sweets 7.62
Butches Bore Shine
Hoppe's
WipeOut
CLR
I know some are not carbon cleaners, but I was surprised by the results.
After draining each case, I took a Q-tip and brushed the inside of the case to try and get it as clean as I could.
In first place.... CLR. Every speck of carbon had come out. Even looked like the primer was clean.
Second. Sweets
Third. Butches
Fourth. X-Treme
Fifth. Wipe Out.
Sixth. Hoppe's.
Picture of the CLR case.

I did this to learn what removes carbon the best for future use in a barrel. I am NOT cleaning brass cases with this!
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