You have no doubt been hearing a lot about the N95 mask. Read the following information and FOLLOW the link below for detailed info.
First, an N95 respirator is a respiratory protective device designed to achieve a very close facial fit and very efficient filtration of airborne particles. The ‘N95’ designation means that when subjected to careful testing, the respirator blocks at least 95 percent of very small (0.3 micron) test particles. Feb 8 2019
But please note – the size of viruses is well below 0.3 microns safety margin of N95 masks! 
Masks are better if you feel you may ALREADY BE INFECTED and do not want to infect others, than they are to prevent infection to yourself. (again – N95 ONLY stops particles ABOVE 0.3 microns)

IMPORTANT: Hand sanitizers need to have at 70% alcohol

Lots of things can kill 100% of bacteria and viruses, but keep in mind, you can’t really “kill” a virus since those things aren’t really considered alive.
But you can denature their protein shells, exposing their DNA or RNA to a harsh enough environment to destroy it. Bacteria are even easier to kill, since there are actually alive to begin with.
To kill bacteria, you can use many different methods of assassination. You can rupture it’s cell membrane, starve it, liquify it’s insides, infect it (causing sterility), poison it, or flat out rip it apart with LYSIS.
In order to destroy 100% of bacteria and viruses, you can use heat to sterilize the area (this is very common in labs) or radiation to “cook” the little nasties, or, if you want to use very extreme measures, you can use a very strong (like 1.5 or 13 PH) acid or base.
What many wipes and solutions contain is either an alcohol or strong oxidizer (think Oxygen Peroxide). In many cases, this actually will kill 100% of the bacteria and viruses, but it’s much safer for big companies to say “almost all of it” than it is to say “ALL of it” because there is always a margin of error that comes into play, allowing for possible legal action against the company.
Here is another good treatise/document from the CDC regarding disinfection and sterilization: