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I have cleaned gas tanks by filling them up with water and detergent, then putting in 3 or 4 cups of sand and small stones. Then, with the tank full, use a pressure washer to agitate the stones for a good safe sandblast using the hole for the gauge. It takes about 2 hours to get out all of the sand and water after repeatedly rinsing but there won't be a speck or rust in it. (Do it off the vehicle) |
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