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To prevent scale boric acid (plain old roach powder) does a pretty good job. Heat blade up just enough to melt the white powder which will form a clear coating over the blade. Sprinkle powder on both sides to get a good coat. This will go a long ways toward preventing scale build up.
Once scale is there, take a cheap 4" side grinder ($10 or so from HF) to lightly grind the scale off. MUCH easier/cheaper than using belts.
Ken
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