I have a couple of kegs that still have a lingering cola smell. They've all been PBW soaked a number of times, and had complete gasket replacements. I have served a couple beers that didn't pick up any noticeable cola odor, so it's probably not a big deal. But does anyone know how to remove this long-lasting odor from the keg? I've heard both that bleach might fix the problem... and that you should not use bleach in stainless, as it will pit it pretty quickly. If bleach is the right answer, what concentration should be used?