Roundup, Advanced, Concentrate, 1LLooking to eliminate unwanted grass and weeds quickly? Look no further than Roundup Advanced Concentrate. This fast acting, herbicidal soap kills grass and weeds with visible results in a few hours up to 2 days after spraying. Specially formulated as a non selective herbicide to control grass and common weeds, including chickweed, corn spurry, dandelion and plantain. Can be used in cultivated areas, too. To spot treat weeds and kill unwanted grasses,