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I know for a fact Simple Green will etch polished aluminum. Been there, done that.
I use the kerosene based engine aerosol cleaners and a parts cleaning brush. Start with the engine warmed up just a bit. After I get as much loosened as I can, then I hit it with a spray nozzle on the hose. If it's really bad, I take it to the coin-op car wash and use the high pressure sprayer. Repeat as necessary.
For routine maintenance cleaning, I just use some Dawn dishwasing liquid in a bucket of hot water.
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- Greg
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