Use pickling vinegar instead of regular white or malt vinegar since it contains 7% acetic acid and not the usual 5%. The ratio of 1 teaspoon (5 millilitres) of liquid washing soap to 1 gallon (4 Litres) pickling vinegar is fine.
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What I have found best for me is to boil a gallon of cheapest
white vinegar to half or even 1/3 making it stronger. Add salt
(1 cup?) and Tb or so of dish soap. Use a small spray bottle
to kill the grass/weeds that creep by and under the garden
fence. Older stubborn grasses with long roots under the old
sidewalk can come back next year and I spray again. I know
this will kill a dandelion, which never returned but I ignore most
lawn weeds. Great for grass edging around flower beds. And
leftover mixture works great the following year.
I really don't think one or two uses would deplete the soil for
replanting later (water well as someone said). Our soil has a
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