In the garden/around the house
Kill grass and weeds: Pour or spray full-strength vinegar on grass or weeds poking through your driveway or rearing their heads in other unsavory places.
In the car
Frost-free windows: If you know a chilly night is on the way, you can ensure that your windows will be frost-free when you wake up in the morning. Simply mix three parts vinegar to one part water, and coat your windows with the mixture the night before.a