There is no weed B Gon.
Butterfly bushes are often marketed as "Weed-B-Gon" because they effectively control many types of common weeds. However, no product called "Weed-B-Gon" specifically targets weed control in the home landscape. Instead, look for a product that contains glyphosate or triclopyr as the active ingredient. These products are widely available at garden centers and hardware stores.