Here I have used GLY-4 [Round-Up] at half of the recommended strength with two results. This level is actually mention on the label for growth regulation of perennial grasses. Now for broadleaf control I use 2-4-D which also controls our wild garlic. Locals calls it wild onions but I know better.
Annual Grasses are reduced if not eliminated.
Second its acts like a growth on perennial grasses thus reducing the frequency of cuttings.
I was plagued by our sage grass which was taking my field of Tall Fescue. After the first year the sage grass was nearly gone and the second year pretty eliminated it. Of course there will always be few bunches around from wind blown seeds.
Here is one key thing the instructions are for one acre applications so just using a hand sprayer can result in horrible results as you can easily over apply it.
