Answer:
White Vinegar is a great natural weed killer. To use White Vinegar to kill weeds, simply spray full strength White Vinegar onto the weed you would like rid of. The Acetic acid in the White Vinegar sucks the moisture from the weed, killing it.
NB Be very careful to only spray the weed, and not surrounding plants as it will kill the plant in exactly the same way it kills the weed!