This is one of the best low-cost and natural ways to kill weeds.
What you need:
1 Gallon Sprayer
I like to use a one gallon pump sprayer
Add one gallon of vinegar to the sprayer. You will want to use 5%-9% vinegar at full strength.
Once you fill the sprayer with vinegar then add a few big squirts of soap The vinegar can be applied without soap but it is more effective with soap. You can also add salt to the mix for added effectiveness.
Spaying on a warm sunny day will give better results.