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People also use Simple Green but I am wary of the health consequences
of exposure to the active ingredient, 2-Butoxyethanol.
Also, there were concerns about SG in the aviation field and its effects on
alloy metals like aluminum. A product called 'Extreme Simple Green Aircraft
& Precision Cleaner' was subsequently released.
Watch out for the bearing on the tensioner/idler pulley, do not wash the
lubrication from these points.
After it is scraped clean with a putty knife, Sun Light dish soap with a tooth brush or larger brush, depending in the size of the part, does a good job. If you plan to paint, degrease with rubbing alcohol or lacquer thinner.