Hmm, I have a fastidious friend just like you, gets very upset when I point to something on the LCD screen and just
barely touch it with tips of fingernails and end of finger, while pointing to a spot on the screen. You know, he is such a butthead, I need to point and lightly touch the screen to hammer in the point of emphasis to the stubborn ignoramous. Then he gets all insulting claiming I'm smearing up his screen (while continuing to refuse to acknowledge his flawed logic on the point I'm making), and he's got to use industrial cleaner/needs to steam clean it with high-pressure gun to remove my greasy finger prints from his keyboard and screen. Too lazy to clean his screen and keyboard I guess. I suppose he has no natural oils on his skin then, dry as a dead horse leather, hippo-creet.