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Simple Green is very corrosive, especially if you don't get it all washed off. If you have a polished aluminum surface it will instantly dull it.I've some simple green aircraft cleaner
Why can't you hot tank aluminum?https://www.speed-talk.com/forum/viewtopic.php?t=20372How about oven cleaner to get the intake manifold gunk off. Can't hot tank aluminum. Safe on the aluminum I believe, but what about the plastic part?