My driveway is about 1/4 mile long, made of crushed rock. After winter snowplowing I have a lot of rocks in the grass. Most are relatively small, less than 2 inches, but they are all along the driveway on both sides so there are too many to pick up by hand. I have a 5 foot "landscape rake" on the back of a tractor, but it misses most. Is there any good way to get them out of the grass before I start mowing? Thanks!