Greg, I'm going to catch a lot of flack on this one, But I have used it and so has many plumbers.I went to my local hardware store bought a gallon of sulphiric acid (Professional Drain cleaner, for removing grease, soap and anything else in household drain pipes). Been used for years in galvanized, black iron pipes, drains. I ran a test on an extra galvanized tank before I used it in mine good tank, all it did was remove the exterier rust and paint. I put in about 1/2 gallon in tank then put cap back on rotated tank to get acid on all sides of tank, let it sit for 8 to 10 hours. I rotated tank every couple of hours or when ever I thought about it. Then I drained the acid out, back into my original container, flushed tank out with water 2 or 3 times. After which I checked the inside of my tank, looked almost as good as new. One thing that you need to do immediately after tank has dried is put in some oil or diesel as tank will flash rust in a short time. Do a test run on an old tank or piece of metel to ease your mind.... PS I also used this to clean a hydraulic tank, as I did not want any rust or foriegn material contaminating my hydraulic system.
Keith & Shawn
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