A good vinegar mixture to kill weeds is 1 gallon of household white vinegar and 1 cup of salt. Blend the mixture and pour it into a plastic spray bottle, drenching the weeds on a dry and sunny day. Plants soaked in the solution will die within a few days.
This vinegar mixture can be capped and stored in a cool spot indefinitely.
Another mixture for vinegar weed killer is 1 ounce of dish washing soap per gallon of vinegar. Weeds will die faster with stronger vinegar and stronger soap. This mixture is likely to kill weeds on the surface, but certain types of weeds with strong roots may grow back.