Health organizations like the CDC and the WHO define disinfection as the near total removal of germs from a surface or an area. Sanitization refers to lowering germ populations to reasonably safe levels. Safe for humans that is, not for the germs.
Realistically speaking, you’ll be able to sanitize your monitor at best because no matter what material your screen is made of, the tough chemicals and agents needed to aggressively kill off germ populations en masse will also destroy your screen. Avoid ethanol, rubbing alcohol, and bleach. These can leave permanent scars on your screen or, at the very least, ruin the monitor’s lustrous glossy surface or beautiful matte finish. Check manufacturer’s recommendations about cleaning the base and stand, as these surfaces are often much more welcoming of cleaning agents.
By most accounts, regular soap isn’t much better and may also damage monitor surfaces because of the presence of lye, which is very caustic. Window cleaners are out, too. You see, there’s a surprising amount of tech behind your monitor screen and maintaining it properly is important for getting good results and not doing unintended damage. So, short answer, the best way to reduce germs on your screen is to avoid touching it, to cover coughs and sneezes, and to eat lunch/snacks facing away from your display.