I have heard people use gasoline or kerosene to kill weeds. NEVER use either of these to kill your weeds, they may kill the weeds but they stay in the ground for years and could even leach into your drinking water. Only 1 gallon of oil-based product can pollute 1 million gallons of water.

What liquid kills weeds permanently?

Yes, vinegar does kill weeds permanently and is a viable alternative to synthetic chemicals. Distilled, white, and malt vinegar all work well to stop weed growth.

What kills weeds instantly?

When looking for a natural alternative to herbicides, a cocktail of vinegar, salt and liquid dish soap has all of the ingredients needed to quickly kill weeds. Acetic acid in the vinegar and the salt are both very good at drawing moisture from weeds.