Sand the worst of the rough stuff and spray it with WD40 (Go easy as you
don't want to make the rungs slippery).
If the corrosion is really bad, you might have lost some structural
integrity. Salt water/air are tough on aluminum.
Ladders are almost never repaired only replaced. A good ladder will
last a lifetime if properly stored. I have a nice selection of
ladders. One time one of my step ladder got dented somehow and would
not sit level. I had to toss it even though it was an expensive
I had a 16 footer that got damaged, tossed 1/2 the other half I use in
my shed with 10 foot cieling height.
If its cosmetic wash and perhaps spray with clear acrylic, if its
ANYTHING even remotely structural sell it for scrap and buy a new one.
WAY TOO EASY TO GET HURT!
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