Roundup the whole thing and start over.....
Yup, give it the old Ruddly one-two punch!
I think his was an 8-9 KO if memory serves.
Matt try Trimec Plus it might work read the spec. page.
I've been using Scott's 4 step. Oddly enough I found out today that what I thought was crab grass is actually a weird variety of blue grass so what I've been using may be doing the trick. Gotta figure out exactly what crab grass looks like I guess.
Where do you pick up Trimec?