6. Oily mobile screen! Never use a paper towel.
Try a microfiber cloth to clean your mobile or any gadget screen. If you use a paper towel, there would be the chances of scratch on the screen.
7. What to do with monitor screens?
No paper towel, no cloth! You can remove the dust from your monitor screen just using a coffee filter. It works better. There is no chance of getting a scratch on the screen using them.