According to the United States Department of Agriculture, a product that is found in nearly every household is an effective, natural weed killer. Vinegar, which most people keep in the pantry as a cooking product, can be used to kill weeds because it contains acetic acid. In a 2002 study conducted by the USDA, vinegar with a 10 percent to 20 percent concentration of acetic acid killed most common weeds. However, most household vinegar contains only 5 percent acetic acid. When using household vinegar, be aware that results can vary.
Pull on kitchen gloves before handling salt, detergent and vinegar.
Pour vinegar into a stock pot. Add salt and stir while simmering until salt is dissolved. Add 2 tablespoons of liquid detergent.
Pour liquid herbicide into a spray bottle. Spray onto the leaves of weeds until the leaves are saturated.
Wait for the plant to die. Signs of plant death include brown, dry and crumbling leaves. Remove vegetation.
Observe the ground for signs that the plant is re-emerging. Reapply the herbicide as needed.