I recently (45 days ago) had my driveway paved. Now there is a lot of grass growing up in the driveway, not along the edges but up in the middle of the driveway. How can I kill it. I have tried roundup and it makes the asphalt slimy but does not kill the grass. My $16000 driveway is starting to look worse that it did before paving. The contractor said he salted the area to keep the grass from growing, now he says there is nothing he can/will do. Any help is greatly appreciated. Homer