I mean like, after I type a password on a computer, I’d rub my fingers across the entire keyboard to make sure any fingerprints/oil-residues gets evenly distributed so its harder to know the password. Same with phone unlock codes, I just use my fingers to rub against the part of the screen where the virtual keyboard was displayed.
Am I being weird? I’ve had this habit since the first time I got my first digital electronics.
No. If you’ve used it to input literally anything else you’ve already obfuscated the password (typing on keyboard, using apps on phone). Besides that, there is no telling the length, number of repeated characters, or shift combined (capital letters, symbols) involved just by looking at finger prints on a keyboard.
Two factor authentication and other layered security is low effort and more effective. If you’re worried about a PIN for debit cards the greater concern is skimmers, common at gas stations and atms. The best preventative here is to become familiar with checking for those and minimizing how much money is in your debit account - keep it in savings, use a credit card instead where able.
I do clean my phone screen and keyboards occasionally just because they can get gross.