That may not be mould. It could be oxidation due to high humidity.
Aluminium in particular turns into a white powder and even when it is
removed an etched spot is left. They need to increase the air circulation
or install a dehumidifier. Whether it is mildew or oxidation, that stuff is
going to be ruined if they don't do something fast.
In a tight enclosure, when it gets cool the air inside contracts and sucks
in moist air. Condensation occurs, and when it gets warmer, the air expands
and air escapes, but the condensed moisture stays in. Oven time the
moisture builds up until the humidity reaches nearly 100%. Often everything
in the enclosure sweats and becomes wet to the touch. Equipment will not
last long in that kind of environment. It would be better to leave it
outside exposed to the weather; at least it would dry out between rains.
Don K4KYV
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