Think of all the places you put your phone down during the day: the kitchen counter, a bathroom stall, your restaurant table—talk about a germ-fest. In fact, a 2012 University of Arizona study found that cell phones may carry 10 times the amount of bacteria than toilet seats. To disinfect your devices, Apple suggests using a Lysol or Clorox disinfecting wipe. Just be sure to shut down your phone, squeeze out any excess liquid (you don’t want a pool of the stuff sitting on your screen), and dry it off with a soft lint-free cloth. Keep in mind that while bleach is great for banishing viruses, products containing the substance might damage your phone.
Source: Prevention