i wipe mine on my shirt
#2 Clorox wipes do not actually use bleach. (FYI) but would probably would work best at streaking your screen (though it would also probably kill germs too)
#3 Alcohol is relatively safe and will kill germs, but I would use something like cotton swabs (or microfiber) for two reasons, one because you don't want to leave behind paper towel fibers all over and 2 you don't want whatever you use to "drip" excess onto (or into) the device.
#4 NO! NO! NO! NO! Do not use Hydrogen Peroxide. Oxygen has a known corrosive effect on ferrous metals.
#5 No comment - I have no idea.
#6 I have my doubts.
#7 Not if you like your phone!
OG Droid->Incredible->Droid X->Incredible->Incredible 2->Incredible->Samsung Charge->HTC Rezound
Not to say that your fear is not legitimate, but people wonder why we have resistant bacteria and viruses (staph is a big one in gyms for improper disinfecting). All because of people using disinfectant way to often and improperly.
Just remember your the only one touching it so you should be fine. And don't disinfect yourself.