There is a blended herbicide on the market that mixes 2,4-D & 3,5,6-T (Triclopyr) that works on most any broadleaf. Can't recall the tradename offhand, and you can mix it yourself anyway.
The commercial guys use this. btw, 3,5,6-T is the successor to 2,4,5-T (tradename: Silvex) which was blended with 2,4-D to create 'agent orange' to defoliate Vietnam. the 'orange' was attributed by the miltary to the color of the drums it was supplied in.
Silvex was the bad actor that had the highly carcinogenetic byproduct dioxin in it - it also persists in the environment. Triclopyr is almost as effective, contains no dioxin, and has a reasonable biodegradation life (weeks, not years).