THAT is the kind of information we need! If this is quoted from the
manufacturer then I read it as saying it "can accelerate the corrosion "
(which is true of almost ALL household cleaners since most cleaners are
"mildly alkaline"). I wouldn't worry a lot about the Navy tests and the
lack of a Mil-Spec approval (I was an engineer for the Navy for 25+ years on
the A-6 program and DID these kinds of tests). The sandwich corrosion and
long-term immersion-corrosion tests would be failed by almost ANY common
cleaning solution. The sandwich test involves trapping the cleaner between
two sheets of bare aluminum and exposure to different saline environments.
Almost EVERYTHING fails at some level including clean, filtered de-ionized
water. I would say NO cleaner should be left on a surface for ten minutes
(or even be allowed to dry there at all). If nothing else it is a BEAR to
get the film off.
For myself, I plan to continue using Lemon Pledge (ducking for cover) on my
windshield and will use the Simple Green on my fabric surfaces against
really tough soil (like bug splats on leading edges and belly grime) with a
GOOD rinse afterwards. I'll continue avoiding the aluminum skins,
especially where two or more layers are riveted together, with ALL cleaners.
By the way, the Lemon Pledge does a GREAT job taking bugs off leading edges
and works REALLY well on my wood prop.
Hank (Awaiting the "incoming rounds" on Pledge- no "Mil-Spec approval" there
either) J


"Thomas Borchert" wrote in message
...
Hjarrett,

I'm not saying they are true or not but I
have NEVER had anyone give definitive proof that it actually happens.


Well, the guys at Aviation Consumer got this from the manufacturer (I
hope it's ok to quote this):

"Simple Green is a household cleaner that's mildly alkaline. Its
manufacturer, Sunshine Makers, Inc., says "the aqueous-base and
alkalinity of Simple Green...can accelerate the corrosion process.
Therefore, contact times of...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."

Sunshine Makers notes that Simple Green doesn't have Mil-Spec approval
and Navy tests done in 1993 revealed that Simple Green failed sandwich
corrosion and long-term immersion-corrosion tests on aluminum. "

They conclude it wouldn't be their first choice and they would at least
only use it on painted surfaces and rinse very thoroughly.

--
Thomas Borchert (EDDH)





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