You get a lot more for your money buying industrial strength stuff. The ortho type products do work well, but you get mor bang for your buck from an ag products supplier. The herbicide you select for ground ivy (creeping Charlie)will also control many other lawn weeds, like dandilions
But also, keeping a well seeded lawn and fertilized will also help to choke out weed and keep a nice healthy looking lawn, be careful not to over-fertilize though as this will burn it badly and possibly kill lots of grass. creeping charlie thrives more on thin or shaded or both areas of the lawn, but can also move to sunnier areas. With any herbicide application, the key is proper application procedure, and proper application time, The charlie should be starting to bloom soon and that is one of the best times to get rid of it. 