I did some hard core research on PM. PM lives within the plant so sprays are not that effective. As soon as the leaves grow and make new surfaces the PM will come back. Sulfur burners are very effective but cant be used in late flowering.
Serenade like edwardschlosser said will only retard it it will not kill it. I don't think there is a cure for it no matter what manufactures say! Either make/buy a sulfer burner or destroy all affected plants and start over. I know it sucks but that's life. I had to throw away about 8 oz of SuperSilver Haze because the sprays made it smell and taste like crap. Serenade has a horrible smell so be careful where you spray it. Its best to use it in the bath tub then wash it all down when your done spraying. Most sprays have sulfur in it to fight PM. Sulfur as you know smells like rotten eggs and tastes worst.

Keep temps above 77 and keep humidity below 45% to limit how much it spreads. PM hates hot and dry. So at night yes you need to keep the blowers going otherwise humidity gets out of control. Its OK if the temps get into high 50's. If colder draw air in from inside your house.

A sulfur burner used early in flower can prevent PM. Sulfur burners coat everything in your room with sulfur so spores have no place to live. Sprays wear off and spores off walls and floors get to work. Burner coats walls and floors.

My last grow I had PM. I tried 5 sprays, none worked for more than a week. I wish I had just killed them all and started over cause it killed my yield and had a bad taste from sprays and delayed the next grow by 6 weeks. The PM gets deep into the plant. After harvest I cleaned my room with bleach and lots of it, every surface and every piece of equipment had to be decontaminated. I also built an air filter for incoming air. Out side of where I live is very shady and wet so most plants out side have PM. The spores had come in via my intake air duct. I am a week away from harvest on my 1st grow since the PM, and there are no signs of PM. SO if you decontaminate your room and filter the air you shouldn't get it again.