Try ZEP, water base, but will even fizz aluminum if left too long. Spray and saturate on a hot engine or tranny with a pump sprayer and let it set NOT long enough to dry and pressure wash. Same with grease stains in concrete, don't let it dry, and pressure wash. Don't get any on your hands very long or you will be peeling skin off. Buy it at Lowes or Home Depot in gallon jugs.
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