Grass trimmings
 

Love how nice TV landscaping generally looks.

Notice how many landscapers cut and trim lawns but leave piles of grass clippings in the gutters/curbs especially along the roads with sidewalks.

Please ask your mowers to clean up the borders near your yard including the street borders.

I have never seen a landscaper actually pick up grass clippings. When done mowing and weed whacking, they simply fire up the leaf blower and blow the clippings off of their clients driveway and walkways. The clippings have to windup somewhere.

Most landscapers blow the clippings back onto the lawn from the curb area and driveway. Have never seen them just leave them. I would definitely TELL them to do it.