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I have heard the same thing about Simple Green and aluminum. I'm not sure if it's true or not. I was using it one time to do a quick spruce-up of the engine bay on the 911 and did discover it attacked either the paint or the wax on the rear fenders. I had to resort to rubbing compound to restore the paint finish; it looked as though it had hard water spots on it. I don't think I will use it like that again.
I have had better luck cleaning greasy stuff with Castrol Super Clean. I went to that after my trouble with Simple Green and painted surfaces. It rinses off with water just like Simple Green, but seems to do a much better job.
The other product that seems pretty popular for cleaning bikes is the S100 foam. All the bike shops have it; it's kind of the industry standard. It's not supposed to harm any finishes commonly found on bikes. I have used it, and it did work, but I thought the Super Clean did a better job. The S100 does specifically say, on its label, to rinse VERY thoroughly with lots of water, or risk damage to aluminum parts. That kind of worries me, but it doesn't seem to bother anyone else that uses it.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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