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When I was in the Navy, we used toothpaste to clean the "piping", the white stripes, on our dress uniforms. Great bleach.
This is NOT a great idea for 2 reasons. First there are carcinogenic compounds that can leach into the soil and be taken up by the potatoes. Second, the black tires can make the soil too hot and reduce yields dramatically. I would not touch this method. Build your silos out of untreated 2x6 boards instead to be safe.
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