These are my 2 main lawn scourges, Creeping Charlie and Powdery Mildew.Charlie:
It's been my nemesis for many years now. Lots of Borax solution did almost nothing. Charlie was the dominant green in my back yard last year when I finally gave up on "organic" means of it's control and used Scots Turf builder +2 which did the job. Some small amount has grown back from the years of seed it deposited. I'll try pulling it up wherever I see it unless it gets out of hand. Then It'll be back to the Scots.
This occurs only in the front lawn where there's lots more shade and the soil has had tons of tree debris mowed down into it.
I've read about milk as a treatment and baking soda as a preventative. Both are used in water sprayed on. The milk in a 1 to 10 mix and the baking soda, 1 tbsp to a gallon. I plan to try a combination of both. Wish me luck.