I would think that after you used the rubbermaid cans for awhile, you'd cure them. It never hurts to be extra careful when using non-aquarium items around your reef.
The section about the guy using car wash detergent drums makes an excellent point. Sometimes free is the worst possible choice. Why risk your reef for a small savings of money? If the savings were going to be something like $500, then maybe, but for the cost of a new garbage can, why?
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