The Aircraft Simple Green is "safe for aluminum", which is unusual in the cleaning products.
A lot of products (409) will cause corrosion of Al. I've heard stories of significant aircraft damage done using 409 degreaser/cleaner.
The Aircraft Simple Green has been out several years, but I've never run across a source other than mail order..so I've done without it. I would like to try it on exhaust stains.
-Tad Cessna 175
