How do I get rid of it?
I have had it in the same spot the past couple years and it hasn't caused much of a problem. This year it has been worse than ever. The grass that has it has definitely been stunted and is not growing nearly the same rate of the grass that doesn't have the mildew.
I know that increased sunlight to the area will help get rid of the stuff, but it is on the north side of the house and also in the shade of my deck for most of the day.

