This is not a very clear photo but it was sprayed just 4 hours before on a sunny day and you can see the weed is already brown. I was amazed at how quickly and effectively it killed the tops. I sprayed this path once and it stayed clear for almost 3 weeks. Obviously the spray does not kill the roots with just one application perhaps you will need 2 or 3 to actually kill the roots off.
10 fluid ounces of any vinegar (I used red wine as that was what I had)
1 table spoon of salt.
Washing up liquid
Mix all the ingredients together
Place in a spray bottle
Spray where needed. (It really is that simple)
We use this on the paths to keep the weeds from hiding the rocks. I have found that spraying it in the morning on a fine day will kill the weeds by dinnertime. I just use this for the low growing weeds. I guess it would be just as effective on bigger weeds but the amount you would have to make would be times 10.