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 - Oliver 550 Clutch Overhaul Tips - by Greg Sheppard. I got my 1964 Oliver Model 550 (serial 141-139-519) second-hand and used it for several years before the clutch began to slip. After taking up the pedal linkage several times I saw it was going to take more than that. The engine had been leaking oil at the rear seal and I suspected
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