On 11/7/2020 8:49 PM, Jeff Liebermann wrote:

snip

Drivel: I also had some rust damage when storing my bicycle in a
spare bedroom over one winter. It wasn't condensation that created
the problem, but rather a bottle of sulfuric acid in the same closet.
I got the clue when all the coat hangers, metal buttons, and other
metal things in the closet began to corrode.

Yeah, I stopped storing hydrochloric acid in a bedroom closet because of
the same problem. Other than rust, a bedroom closet is the obvious place
to store acid.