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Have you tried AgriculturalHave you tried Agricultural vinegar? Check Amazon if you want to try. I have been using some of about a month and have been happy with the results. Only kills what you put it on. Did not work on salt grass.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?