http://www.6mmbr.com/corrosiontest.html shows tests with a few products including Corrosion-X, Break Free, Eezox, plus a few others. The 11-week test at the end of the page shows Eezox and Break Free CLP (old and new) looking OK, although Corrosion-X is not shown in that one. Corrsion-X is among the best in the tests that included it.