White Patches

[jwhitley527]

Hi everyone,
It has been a long time since I have posted my rescues are all doing great I repotted most in Semi Hydro. This particular orchid Den. Royal wings is brand new to my collection. I purchased her three months ago and two weeks ago I noticed this white what looks like powdery mildew on the leaves. Does anyone have an idea of what it may be. I have cleaned the leaves with alcohol dish soap water mix, lemon juice, and straight peroxide. I have a grow space set like a greenhouse has two fans in it humidity is 60 temp it 80. here are some pictures.

Thanks everyone

Julie