[csmlawn]

The vine grass sounds like bermudagrass.

http://www.weedalert.com/weed_pages/wa_bermudagrass.htm

I have had luck pulling it up when I see it to control this weed. The only thing else that will control it in turf is Fluazifop-p-butyl. I wouldn't kill the entire lawn every 4-5 years... that's a waste of money.