does vinegar kill bacteria?

Acetic acid (vinegar) is an effective mycobactericidal disinfectant that should also be active against most other bacteria. These findings are consistent with and extend the results of studies performed in the early and mid-20th century on the disinfectant capacity of organic acids.

Even undiluted vinegar doesn’t kill viruses sufficiently to qualify as an EPA-registered disinfectant, and it doesn’t kill dangerous bacteria like staphylococcus.