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How to kill weeds with vinegar
Buy white vinegar.
Go to your local grocery store and buy a bottle of basic vinegar, typically a 5% concentration of acetic acid. The best bargain is probably to buy a one gallon jug unless you only have a few weeds.
If you are killing a lot of weeds, you may need to buy more than one gallon, but one gallon will cover a large area. The acid in vinegar is what kills the weeds.