What's the most passes anyone has ever had to do with wipeout to take care of copper fouling? I bought a pre 64 model 70 in 264 win mag that was shooting all over the place. Decided to give it a good cleaning before I tried anything else. I'm on my sixth pass with wipeout with about 30 passes with a brush in between and the patches are still coming out bright blue after soaking for a day. Usually two passes is enough to take care of a lot of it.