Was just wondering what to use to clean the oil out of the drum? I can't remember the name of the oil but the drum was used at a food flavoring plant. Thanks.
vinegar and water. Repeatedly with multiple soaks. Rinsing is key. A lot of it. Worse case, if you don't get all of the vinegar out, it will be diluted by your ro/di and act like vodka dosing. Not ideal, but you reduce the potential harm from not getting it all out. Bleach is another monster I would stay away from IMO. Maybe use a mild soap the first couple of rinses too. After good rinsing and good vinegar water rinses, the soap would be completely gone. Good luck!
I have one of these drums. It's been cleaned every which way over and over, sitting and getting washed out with rain water for a year and still leaches. It's become a permanent rain barrel now. It was from a juice plant.