Tom, I have not tried that with cleth that I recall; As you say it does work with roundup. It makes a lot of sense though and sounds like a very good idea. You will be encouraging the grass to grow again and the chemicals I've used work best on actively growing plants versus mature plants or those in various stages of grow dormancy.Another thing to look forward to in retirement Dave, what are your thoughts about mowing, waiting a week and then spraying the new growth with Cleth. More effective than spraying more mature growth? I know this makes a difference with Gly.