Eliminating Creeping Charlie.
Creeping Charlie is a very difficult weed to control. You can get pretty good kill by using a broadleaf herbicide with 2,4-D and Triclopyr mixed together. There are a couple of companies that market this mixture, and you should be able to find this in most garden centers or big-box hardware stores.
Now is the best time to apply it. Be sure to read and follow all label directions.