How to kill weeds along a garden edge and grass in between blocks?

Vinegar/water spray

I Mix one cup of vinegar, one cup of salt to two gallons water in a garden sprayer. Saturate the weeds till dripping. Do noit use on lawn or in garden. Will kill everything.

Vinegar

This is our recipe: 1 gallon vinegar, 2 cups Epsom salts, and 1/3 cup Dawn dish soap (blue). Put on early in a.m. after dew is evaporated and spray all the weeds. They will be dead by eve. This works best on a sunny day. You can get inexpensive sprayers now at home improvement stores to simplify and reapply when needed.

Use a mix of one gallon vinegar, along with a tablespoon of dish liquid and a 1/2 cup salt if you want. Do not use this mix on lawns or where there are flowering plants.