In a test done by a laboratory quite a few years back, it was found that the real danger, a few certain bacteria and a lot of viruses, aren't affected by alcohol at all - they're just moved around (which makes wiping your arm with a swab before getting a shot or having blood drawn kind of ludicrous). Putting your fork down on your napkin, then picking it up and eating with it, or leaving your food uncovered on the plate while you're eating, is far more dangerous than putting a few bacteria on your outer ear. (One of the functions of ear wax is to wash micro-organisms out of your ear canal.)
I use a microfiber cloth, with one corner dampened with lens cleaning fluid, to get the oil and fingerprints off the screen, then use the dry part to wipe the screen.
Do you sanitize the steering wheel in your car before you drive? That collects a LOT more germs than your phone does. So does the door handle - don't open the car door before sanitizing the handle.
IOW, we worry about something trivial while ignoring much greater dangers. Just sitting on a car seat that hasn't been sanitized transfers germs to the inside of your body. (BTW, they're the same germs we breathe in all day and night - we've evolved to not only be immune to most of them, but to need a lot of them. Mitochondria was once a germ.)
If you want a real awakening, get access to a 200X or 300X microscope, comb your eyebrows onto a piece of filter paper and look at it under the scope. That's what lives on you all the time, and you'd probably die without most of it.