Specialty Gardening: Containers and powdery mildew??, 0 by mstish

mstish wrote:
Hi everyone. I rarely post in the containers thread but I am hoping one of you could help me with a problem.
I had clematis in these barrels and continually had to spray for powdery mildew. Finally I moved the clems to the ground (they needed more root space anyway). I would like to re-use these barrels and the dirt.
What can I rinse through the dirt and what can I clean the inside of the barrels with that will kill the powdery mildew?