Do you have unwanted weeds and grass in your paved walkway? We do too, show roque sprouts who’s the bos. All you need to do is to pour 4 oz. of  lemon juice in 1 qt. spray bottle and fill the rest with white vinegar. The acetic acid in vinegar and the citric acid in lemon juice eat away at the stems and dry the roots to deter the intruders for good. It  is easy and you can save money to buy the bottle of weed killer and very effective.