Simple Green is pretty good stuff, for being natural and all.
Just remember to rinse any aluminum VERY well afterwards.
Aluminum + Simple Green / water + extended time period = Unhappy aluminum.
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Originally Posted by Simple Green
Simple Green products have been successfully and safely used on aircraft, automotive, industrial and consumer aluminum items for over 20 years. However, caution and common sense must be used: Aluminum is a soft metal that easily corrodes with unprotected exposure to water. The aqueous-base and alkalinity of Simple Green or Crystal Simple Green can accelerate the corrosion process. Therefore, contact times of All-Purpose Simple Green and Crystal Simple Green with unprotected or unpainted aluminum surfaces should be kept as brief as the job will allow - never for more than 10 minutes. Large cleaning jobs should be conducted in smaller-area stages to achieve lower contact time. Rinsing after cleaning should always be extremely thorough - paying special attention to flush out cracks and crevices to remove all Simple Green/Crystal Simple Green residues. Unfinished, uncoated or unpainted aluminum cleaned with Simple Green products should receive some sort of protectant after cleaning to prevent oxidation.
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'02 EB Z06 
mods: Vararam intake, Breathless bridge, Dynatech Supermaxx SS headers & X-pipe, Breathless shifter, Dyno tuned (~400 RWHP).
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'01 Camaro SS M6 (Lid & Nitto 555Rs, best 12.6@110)
'95 Formula M6 (CAI, Mac hdrs/Y, cutout, SZ50EPs, best 13.6@103)
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