Here's an informal 'test' I did to see how a bullet would react to being submerged in bore cleaner; specifically, copper cleaner. This is only a comparison of Boretech and KG products, because I've already satisfied myself that these are dramatically better than pretty well everything else on the market. I've seen this kind of thing done by others online, so at least this comparison will be similar to those efforts, even if they're not a controlled evaluation of gilding metal removal from the inside of a barrel.
So, I started with this:
Boretech's Cu+2 on the left, Eliminator in the middle, and KG-12 on the right. All I did was put these 26-cal bullets in the plastic cups, fill the cups with enough of the cleaners to just submerge them, and let them sit. I did NOT swirl, roll, rub, nor otherwise mess with the cups & bullets during the test. At the end, I DID wipe them with a paper towel as hard as I could without breaking through the fiber of the towel.
The Boretech products seemed to 'disappear' at a very slow rate during the initial hour or two of the test, so a couple times I had to add some more solution to those cups. The KG-12 did not disappear until I left the bullets overnight. When I got to them this morning, the KG bullet was no longer submerged, but it was mostly still covered by the cleaner. Close enough, I guess!
I weighed each bullet on my cheapie electronic scale before pouring the solution over them. No fans nor the HVAC system were running for any of the weights, and I made sure the scale was zero'd before each weight was taken. The Cu+2 bullet weighed 140.4 grains, the Eliminator bullet weighed 139.8, and the KG-12 bullet weighed 140.3.
For those not familiar, the Boretech products are clear and thin, very much like water. The KG-12 is an orangey-yellow solution that is somewhat more viscous than the other products. The Boretech products instantly started to turn blue or blue-green when I poured them over the bullets. The KG didn't change color.
After 25 minutes, the 2 bullets in the Boretech products looked nice and shiny under the liquids, just like when they came out of the box. The bullet in the KG solution was significantly 'frosted' and dull. The Boretech liquids had increased in 'blue-ness,' and the KG solution still looked the same.
Here's what they looked like after sitting for about an hour:
You can see that the Cu+2 is more blue than the Eliminator; which difference held throughout the test. The KG still looks like it did when it came out of the bottle. By now, the Cu+2 bullet looks moderately frosted, the Eliminator bullet is still quite shiny, and the KG bullet looks terrible! After this, I put a piece of plastic wrap loosely over the top of the three cups and let them sit until morning.