Please see the following test results, measured in grains of actual copper removed.
I won't even overtly name the product at this point.
But its use mirrors my own results in actual field use for the last three years after
40 frustrating years of everything else.
One session -- very wet patch, wait 10 min while packing up range gear, dry patch out.
No blue at all
then using Butch's Bore Shine merely for indicator purposes thereafter.