Powdery mildew

I noticed a couple spots on my seedlings a few days ago barely visible and I had wondered if it was some debris from my foliar spray. I brought them down to a room I had a clone in and it looks like it is now on my clone. Does this look like powdery mildew to you? I sprayed it with neem oil 20 minutes ago. I think that's the only thing I have that may be effective.
Thanks in advance.
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