Where do you work, Jason? The ones I can get my filthy mitts on have had soy sauce, vinegar, or mustard in them as well - and no one has has any problems with them. My drum "hook-up" is a dude who works at Reckitt Benkieser or whatever the heck it's called.
I would think that as long as the barrels were deemed fit for the food industry, they'd good for reef purposes after a good RO soak - but no one has ever confused me with Stephen Hawking, either...
:smokin: