I had this problem for months now that my Vive Pro keeps fogging up especially while I perform physical activities in VR. I tried to create a better seal against my face but my face is very round and flat. I have found that sweating profusely has maybe caused the seal to get saturated with salt but it is difficult to clean. I tried breathing on the lenses but they only fog up more with the moisture in my breath. This might sound a bit weird but if I take off my head set and fart into it gently, the warm air seems to clear the lenses pretty well. Does the Index have lenses that fog up? Is this a problem that I cannot overcome?