Silver aluminium window. Why are you so stained by rain?

New Sangthai got the answer.

Rainwater that falls got mild acidity. Especially the first rainwater rinsed through air pollution.

Let's wipe the aluminium with pine oil.

If it’s not out, that’s probably because the aluminium has not been plated for too long. Some factories produced aluminium without plating which made the aluminium was exposed by the mild acidity from rainwater and of course seen the stain.
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