Hello,
If you try to take a moist towel and wipe away at a spot does it come off or spread around at least? If it does then it's definitely wpm and you'll want to cut down any buds that have it, and then any leaves you can clean do so...but this late in flowering it might be easier to just remove any bits you see with it. Then you would want to do a baking soda spray to kill any spores...probably spray and wipe the whole grow area also, increase airflow tremendously and then hope for the best. Wpm can spread very easily which is the worst part.
Lastly when you harvest you could try doing Jorge Cervantes bud washing method to get any lingering pm off, it's basically hydrogen peroxide and water in a tub, wash and then definitely dry to the best of your ability since you're a high humidity zone.
Good luck with the problem-solving and happy harvesting. ✌️