Not legal if its not your own property. But Weed b Gone Max is a good bet. Contains 2,4-D, but also MCPA, dicamba, and triclopyr. Better product--also kills clover and thistle. Use a hand sprayer or backpack. Cover a path about 4 feet wide. About an hour's job--better allow three hours if you are inexperienced.
Get a leaf blower for the gutter cleaning.