At first the vinegar was used only in the kitchen, but now it has a multiple uses. For sure it was the favorite tool for your grandmother if you make a comeback. People are using vinegar very often as a natural low-cost solution for cleaning different things in the house. Also, vinegar is very often used to disinfect wounds and prevent bacteria and microbes in it.
There is an article which shows that when it began to have an idea that there might be very small organism that could tempt against human life, began to consider tools and how to combat and vinegar was among the options as possible solutions.
Sulfur and mercury-based solutions can be used as a alternative, but the effective results of the vinegar are irreplaceable. This is mainly because of the acetic acid, which is a great disinfectant.
In the video below you can see how useful can be toilet paper soaked with vinegar: