I used Milestone on my stiltgrass, works great on the grass in open areas.
Unfortunately the stiltgrass comes up through everything, including junipers, so we can't kill it all.
The deer etc. won't touch it.
When it gets to 2-3foot maturity, it seeds and then falls over so it suffocates anything else in the spring.
Nasty stuff, in rose bushes, veggy garden, woods, pretty much everywhere you look.
Deer will walk through and spread seeds etc.
I spend more time on SG eradication than anything else, trying to find tree trunks, branches and rocks to clear an area is tough with that stuff covering it.