Ortho 24 oz. WeedClear Lawn Weed Killer Base Trigger. This ready-to-use weed killer effectively eliminates over 250 weeds, including broadleaf and dandelion, without harming your lawn when used as directed. You'll see visible results in hours. It works on both Southern and Northern lawns. The active ingredients are Dimethylamine Salt of 2,4-D Acid 0.605%, Dimethylamine Salt of Mecoprop-p Acid 0.149%, Dimcamba Acid 0.026.