Yeh the mpro swabs out blackish , no blue yet. The bottle says 4x quicker than ammonia solvents.
So another question. How many of you get blue/green coming out on patches?
And secondly
If copper fouling is the devil, how does anyone know they have got all or most of it out of the barrel?
Is it a visual thing? Can u see it come out on patches?how does anyone know that these solvents are actually loosening the copper??
Or does everyone just "trust" the writing On the bottle without any visual confirmation ?
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