Need some advise (white powdery mildew treatment)

Hey everyone, haven't been on in a while but nended some advise with my crops. I noticed that my plants have accumulated some white powdery mildew throughout all the plants. It's not severe but in small spots throughout the plants. The plants are a couple days away from being on their third week of flower.

I planned on getting some nutrilife SM-90 and spraying them with that in the evening. Has anyone used this product with success? If so, do you have any pointers that would help me execute this mildew/mold problem more efficiently?

I've heard that you need to remove the existing mildew from leaves, and I started doing that by wiping the affected foliage with a damp paper towel. The only problem with that is that it would take me forever to wipe down each and every leaf considering I have 7 pretty good size plants. What is a quicker efficient way of removing or washing off existing mildew? Again the plants are about to be on their third week of flower.

Please any body's input on their experience with using SM-90 for mildew or anyone's advise on removing/washing existing mildew would be greatly appreciated.

Generally the white powder mildew is a sign of overwatering for a long period of time. What happens is a fungus develops in the roots and then releases spores which land on the leaves and look like the white powder. I have not used SM-90 before, but you there are other things you can do to help. Start spreading you waterings out further so that you are only feeding when the medium is dry an inch deep from the top. If you can get a fan out there as well it can help blow away the spores as they are released. It is crucial you take care of this now, as it can quickly lead to bud rot.

Have you flushed you plants at all during this grow? You may want to do so as that can help with eliminating the fungus at the roots.

Cheers!