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Cleaning aluminum in an ultrasonic cleaner, need a cleaner

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  • Cleaning aluminum in an ultrasonic cleaner, need a cleaner

    I clean old model airplane engines. The engines are made of aluminum, steel and brass. I deal with baked on caster oil (black and hard). I like to use my ultrasonic cleaner, I've tried several cleaners in the tank with mixed results. I have to be careful not to harm the aluminum surface finish or darken it. As an old mechanic I used Kleen Flo carburetor and metal parts cleaner and it works fantastic but my gawd does it stink up the shop, your clothes etc. So I'm looking for a more friendly cleaner. What are you folks recommending?
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