I strongly agree with the above. As a sidelight, many years ago, I was unable to break out an old BB (aluminum frame) and finally took it to the local shop. He couldn't get it loose at the time and asked if he could keep the bike. I said "OK." When I picked it up, sans bracket, a couple of days later I asked him how he did it. He replied that his secret process was to fill the seat tube with Coke and let it sit. He claimed it worked every time...? Hunh. I dunno 'bout this one.