First time with Mighty Wash and not sure how to apply exactly?

So I had mites once before and just trashed the op and cleaned the room. After that I've ran a few cycles without any issues in coco but I'm trying a coco/soil/amendments mix this time and I found my leaves with those notorious little yellow splotches. I got a magnifier loupe and chekced and I did see a small bit of webbing and I believe egg sacs... need a better magnifier to do better...

So I recognize from pics online I'm pretty damn sure it's mites. So I've bought this Mighty Wash after researching but I'm still not 100% sure how to *safely* apply this...

I'm mid/late flower... this is a strain that has a high flower to leaf ratio and sativa dom so narrow thin leaves and not too many per... This is also a notoriously long running strain from what I gather... The flowers are well set and bulking up... So I am afraid of mold/mildew with any liquid applications...

1st question - Can this MW be applied by just spraying tops & bottoms of leaves and if some gets on the buds so be it? Or do you intentionally hit all of the plant to prevent them from migrating into the buds?

2nd question - Any other suggestions to deal with things this late in the game?

I'm hoping I can take plants one by one into a bathroom/tub and just spray there so I can get up & under the leaves easier and not make a mess...

Also I'm trying to interpret all the various threads/sources... what environmental factors encourage/foster the mites? Can I raise or lower my temps/humidity in any way to help address things? I'm sure my humidity is currently low and temps are 70 to 80 ish...

If you spray mighty wash in flower, try your hardest not to spray "in the flowers". If you do, make sure you rinse them off after 24 hours, same with the fan leaves. Turn off your fans and lights for a day untill you rinse the MW off. If you use just water, it will not take MW completly off so make sure to ease the lights and fan back into it. Mighty wash is a contact killer and works great with two dotted mites most of the time, they will not want to stay on your plant and you will have to wipe or rinse off all the dead melted mites. When you lower humidity and temps your actually making things much worse. You want them to reproduce as fast as they can so you can wipe them out quicker with less eggs left behind with the first application. Dropping the lights to 10/14 or 11/13 might help, they dont like less then 12hours of light.