Had this on my two plants for most of flowering. I used GreenCure a bit which worked but later in flowering it burned pistils. Milk/water 1to7 worked well for a bit, and H2O2 w/ water. Eventually just cut down both. I did the Cervantes wash/rinse on both plants. One barely had any WPM to begin with and ended up fine. The other I rinsed, hung, trimmed, then saw more, so I rinsed again. Still saw bits of it further in the bud after the final try before curing. Just yesterday I picked out everything with the tiniest amount on it (maybe 2/3 of it) and decarbed for edibles. I am hoping the remaining is fine but worse case I'll decarb that as well.
Best of luck! It's a real pain. I really wish I had cleaned the clone I think it came from but I didn't know any better at the time. I've done a massive disinfect of the grow tent and room it's in and hoping I can keep it to a minimum this grow. This was with humidity in the low 50s and temps around 72 in the tent. Not sure what else I could've done, plants weren't touching, plenty of ventilation.