St. Augustine Lawn owners, experience with Alexandergrass

In the past I might have had it in a couple of spots and it was easy to deal with by pulling up, but this past year I’ve had an infestation of alexandergrass. For those who are unfamiliar, it’s a particularly nasty summer-annual that doesn’t always die off and if left unchecked can choke out the lawn…Unfortunately, with St. Aug grass there aren’t any selective herbicides that will kill it. I’ve read where baking soda can burn it off without damaging the grass too much, so I guess I’ll give that a try, but I was curious whether anyone else has had experience in dealing with it…Thanks.