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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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