I have one customer who wants a lawn badly. I took care of the 1st step by using my line trimmer to clear out so much of the crabgrass that was all over the property. One month later the crabgrass is coming back. The customer has ruled out using sod since it will cost too much, so we will be using some type of seeding. I was thinking of using a weed killer to kill the rest of the crabgrass, but I don't know want to use one that kills for a whole year before I can grow grass over it. Question: What weed killer can I use for specifically for crabgrass and then plant the grass seed soon after? To me finding a good solution is important because then I'll have a lawn to cut and therefore generate income from. Thanks in advance.