Very few people did this. If you were this paranoid, you left your city to live in the country. Or you didn’t buy your Cheetos for a little bit.

You could just leave shit in the sun for a bit if you really wanted to kill everything. UV and dry air will zap and dessicate a lot. I believe bacteria likes to hide in crevices, so move it around. A few hours of you want to be “sure”.

Remember, infection depends on the amount of exposure. One virion is going to get stuck in your mucus and die. You don’t need to get every one because they can’t replicate outside the body. Salmonella or shit in your bathroom can be way worse than someone sneezing on your Cheetos.