To kill the coronavirus on your hands and on objects like door handles or whatever, is isopropanol bad? According to this pic it seems to not be that great for that purpose. But in the pic it says 70%. What if you use 99.9% iso?

Can I mix isopropanol with a little bit of something else to significantly improve the antiviral effect? So that the mix consists mostly of isopropanol, like 7/10 or 8/10 iso and the rest something else + maybe a bit of water. I ask because I happen to have A LOT of iso (99.9%).