Have you tried KREEN~? Made by KANO LABS, rhe people who make KROIL. If you lived closer I'd give you a little. No abrasives and not metal brushes, just a soak and brush with a nylon brush. Unfortunately it only comes in quarts. Absolutely the absolute best carbon remover I've ever experienced, period~!!!
My experienc has been with years of use in automotive applications (fuel Injectors). and two old rifles, a Win 1890 made in 1927 and a Win 1885 made in 1892
I have not, But have used Kroil - which is good stuff.
The only reason I have Prolix is when my dad passed away he had a nearly full gallon jug of it
left over from his shooting days
I never even heard of the stuff and after using it thought
"Well DAD! why didn't you tell me!" lol
He tried many products and over the years we mainly stuck to
Hoppes 9 and Sweets being the most "Field Effective"
Since we would shoot so much out in the field we had to also clean out in the field
And wanted to get right back to shooting without using some 30 minute regimen.
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So me suddenly having a gallon jug of it I figured ya know what
I'm gonna try this stuff and if its snake oil why keep storing it?
Well................
What I found was.........2 wet patches of Prolix on a cleaning jag
then 1 bore brushing of Sweets
and my bore was sparkling clean as if I had just spent 30 minutes on it with Hoppes and Sweets
And since Prolix doesnt harm the bore, I've been using it since.
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So basically within 5 minutes or less (3 operation then dry patch out)
I can clean any bore I have back down to bare metal.
It is the fastest stuff I have ever tried and really cannot believe how well it cleans every single time I use it.
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The gallon jugs are expensive nowadays ($180) so I doubt anybody is trying the product.
Just relaying my experience with it.
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Interesting that my stuff is green in color and the stuff shown on the net is blue like windex
So I wonder if there is any difference in their formula from mine to now? Dunno
Meaning maybe they put the "good stuff" in it back then
I do know Hoppes is not the same as when I first started using it.
I'll bet the color difference is likely due to some form of oxidation over time.