BC I'll give you a good example of the effectiveness of these Foam Cleaners. I traded for a 6mm Reminton which is very accurate BTW. I shot it a few times and did the usual cleaning routine and put in Wipeout . I let it sit for an hour. The Patch came out Dark Blue. I then flushed the barrel out brushed it 10 times and ran patches thru until clean. I put in Wipeout again for 2 hours. The Patch still came out Dark Blue. I repeated the brushing procedure and then left Wipeout overnite. Next morning the patch came out Dark Blue. At this point I broke out the Foul Out III and hooked it up at 8am that morning. AT 11pm I had already cleaned the barrel twice with a brush because there was so much copper on the sacrificial rod. This barrel was fouled I mean fouled. I then ran JB paste thru it 10 times and put the gun up for the nite. The next day repeat of previous day and finally I got all the copper out after again brushing the bore after running the Foul Out. Lots of copper on the sacrificial rod as well mostly in the first half of it . Now running a cleaning rod down the barrel I can tell the barrel is much smoother . This changes my view of this product. I think maybe for lightly shot guns with custom barrels it will be ok but for the heavy stuff your going to have to use a more industrial stength cleaner. BTW with the fouled up barrel cloverleafs at 200 yards..it is one accurate SOB but cleaning it is a B. This one is getting torn down for a custom in the next week or so.