Hi Cat, this is the one that everyone I know swears by: https://www.hgtv.com/outdoors/gardens/planting-and-maintenance/make-your-own-natural-weed-killer
Cat...Apple cider vinegar 2 cups, Epson salt 1/4 cup and a little Dawn. Shake in a spray bottle and spray areas you want to kill.
Here are a few ideas that might help.
This article looks at all the common natural weedkillers and is really helpful
HI Cat - 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