I agree with Sean give it the vinegar treatment, Once a year I would drain the water heater in our previous newell, fill it with vinegar, drain the vinegar and flush with water. I don't remember who told me this trick, but it did seem to work.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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