Remove any leaves that are too damaged. Move to shaded area or wait till late evening. Wipe off as much mildew as you can with a wet cloth... top to bottom. Blast plant with water. All angles... tops... bottoms... everywhere. If you have any pests, now would be a good time to spray every inch with insecticidal soap or dawn dish soap and water. If you sprayed with soap, rinse after 1 hour. Then spray with neem oil and water or azamax and water (I like to add some potassium silicate for an emulsifier). Repeat every 5 days or as necessary up to 2 weeks before harvest.
There are lots of "solutions" for this, the above it what's worked for me in the past. I never had a WPM infection that was too bad to control though so I never had to go nuclear.
Increase air flow to your plants. Remove dead/damaged plant material, clear out some of the inside leaves, remove leaves that are touching too much.
WPM is in your plant now, so from my experience it will come back if your airflow/condensation isn't in check.