Mix one cup of vinegar, one cup of salt to two gallons water in a garden sprayer. Saturate the weeds till dripping wet. The object is to get down to the weeds. Do not use on lawn or in garden. Will kill everything.
William's reply is very good, but I just use boiling water. It's easier.
You could give one of these a try.
This article looks at all the common natural weedkillers and is really helpful
Hi Paula - The struggle is real, isn't it?!? This is the most effective all-natural weed killer DIY that we use. It's even been featured on Hometalk! Hope this helps! Hugs, Holly
PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean