uhhh lets see man its hard not to spray down now with just R.O. water to wash of the oils you sprayed without having mold you can take extreme care but you still will/might get to much moisture and mold the fuck out of your crop.
Start doing searches for harvest spraying or last minutes foliar feeding of some title search similar to that.I did find and buy some stuff at my hydro shop today called: MilStop (Potassium Bicarbonate)Broad spectrum foliar fundicide name of the company is BioWorks cost me $20 suppose to solve white powdery mildew and other things as long as it has not already spread badly.
If this happened to me I would(im no expert here)plan to harvest ASAP since you said you have only one week left( I would try to use all 7 days)water with proper ph and use Serinade.Do not spray foliage(Possibly able to with a skim milk solution).Lots of AIR movement,humidity 40/60%.you have to get the neem of the buds but how do you do it without mold.Below this guy has the answer..Next grow add silica
This guy had this problem:
Originally Posted by
Momerath 
For a more organic natural way to go, I've found using diluted skim milk (MUST be skim, 0 percent milkfat or it will rot/mold) works great. Diluting to a concentration of about 1:5 or 1:10 (milk:water) works fine. Its damn near impossible to get rid of PM once you have it, especially in flowering, but it can be fought and controlled. I used the milk solution on my outdoor plants this year that had PM and while it did not make it go away, it controlled it enough to where I safely harvested all of my buds, and lost none to it. Also, has zero affect on taste, no unknown/nasty chemicals, and washes cleanly away. Theres many remedies for PM, I've tried this one, as well as neem oil. Both worked, but the smell of the neem can be unsettling, especially when its dripping off of your nearly ripe buds. I liked the milk trick best. Be sure to shake off the excess moisture from your plants after spraying, otherwise you could get mold forming in the inner regions.
And I agree with GIS that one of those hand-pumped sprayers really are best, they make a nice mist/spray and can easily cover every surface. Good luck with the "herpes" of the herb world
Another person with this problem:
That late in flower PM can prove to be a true pain. I've found that Serinade does the job great, it doesn't kill the mildew, but it does know it back. Also, has zero effect on the buds. Can be used up until the day of harvest, if you were inclined...
I try to avoid any potasium bicarbonate stuff in flower, burns the shit out of the pistils...
I cannot vouch for this...but I would try if had no choice over other methods besides Potas Bicarb.
