The Simple Dollar : 15 Uses for Incredibly Inexpensive White Vinegar

The Simple Dollar 15 Uses for Incredibly Inexpensive White Vinegar: "One of the best bargains in your local grocery store is plain old white vinegar. You can get a 32 ounce jug of it (half a gallon) for about $1.50 and it has a multitude of uses beyond the edible ones (like pickles and salad dressings). Here are fifteen uses for white vinegar, most of which I use myself."

We use it as fabric softener and general cleaner all the time. I wouldn't use it as an eyeglass cleaner as it can fog some coatings.

The real problem comes in trying to make more, in a post-TEOTWAWKI world it could be a challenge.
Vinegar is made by having a bacterial colony, called a vinegar mother, metabolize the alcohol into an acid. Well, first you need alcohol like wine (red and white wine vinegars) or spirits (distilled) or even beer (malt).
Generally, you need some yeast to convert starch from grain into alcohol and plenty of clean water.
But first you need a lot of excess grain or fruit to create the alcoholic beverage first and that requires lots of land and water and seeds and farming equipment.

A logistical challenge.