Berryman's Chem Tool in the aerosol can. Then I used something to rub the porcelain clean, probably sand paper. Don't remember but I wanted something that wouldn't leave a residue on the porcelain. Went back and forth on it several times.
I read up on how it works in a motor repair manual, Chilton as I recall, and understanding how it worked, cleaned it up. Took about 30 minutes start to finish for whole job.
Didn't look squeaky clean, but was cleaner than it was. Trying to recall, I think the porcelain looking part of it absorbs exhaust gasses, in doing so measures the O2 and with a layer of exhaust residue over it, it was unable to do that.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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