Originally posted by Audi2Honda
6) Make sure to RINSE THROUGLY. I mean really really rinse the simple green off good. Simple Green while excellent at cleaning dirt, grease, and grim is HIGHLY corrosive to aluminum. If you do not rinse well over time the simple green will corrode and eat through aluminum parts like your head and block if its aluminum. This is why you should use as little as possible. But don't be scared just rinse well and you'll be fine. Let the water run from the hose and flow over the parts you applied the simple green.
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OMG are you serious? Hehe, last time when I cleaned my engine, I sprayed so much of that stuff on there! I sprayed like uHm.. I dunno.. 1/5 of the bottle? Haha, but I did hose it down for like 15 mins. Hope there's no damage..