Hello. I recently have moved into my brother's room across the hall, after he's moved out. For some reason I'm having a rusting problem with my electronics lately. I bought a wireless mouse for my macbook pro, and within 32 months the usb plug is all rusted (see image). As you can imagine I'm freaked out. I'm terrified to plug it into my macbook pro, in fear of the rust spreading. I looked around the room for similar rust and my printer has some pre rusting spots. I'm not sure what's causing all this. I'm terrified to leave my macbook in the room in fear of it rusting. Am I just paranoid or is this something I need to address? Emulsion.