Right before Sprint bought Nextel, dooming both companies, I worked in what they called a “repair store”, taking apart phones and replacing bits and pieces (rubber keypads, boards, displays, most of the gadget)
We saw this all the time: my phone never got wet. Crack it open with the ol’ spudger, find a blue-green mess.
Had one lady bring hers in smelly like pee: her cat.
Had another pull it out of her cleavage: full of salty crystals and moisture.
I never went off that stupid paper, since the moisture of the PacNW air during rainy season is enough to set them off.
But yeah people treat their expensive, sensitive gadgets like shit