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Walter,

>From AvWeb Newswire (18 May 00):

<It's Simple -- Don't Use This To Clean Aircraft
A well-known aviation magazine this month published a feature article on
cleaning one's aircraft and getting it ready for spring flying. Only one
problem -- a product the article recommended as safe for aviation use has
been proven corrosive to aluminum. The product is Simple Green, a popular
household cleaning liquid. According to the magazine's May issue -- which
included a photo of Simple Green and other products -- the liquid "does an
admirable job for a fraction of the cost of the aviation cleaners." While
that may be true as far as it goes, both the U.S. Air Force and the U.S. Army
have conducted tests of Simple Green and strongly urge that it not be used to
clean aluminum structures. In one test conducted by the U.S. Air Force,
results from which were published in 1989, aluminum alloy samples were
immersed in Simple Green for a week then removed, cleaned and weighed. The
results indicated that the approximately 3.5-gram aluminum alloy samples
experienced a material loss of about 31 milligrams in a diluted solution and
a whopping 295 milligram loss after spending a week in the undiluted liquid.
The Air Force report summed it up this way: "We do not recommend the use of
this product on Air Force equipment containing aluminum." Good advice, that.

NOTE: Check out the USAF report for yourself, available in Adobe PDF format,
.....
>

Scott Krueger
N92EX
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