Hi I had this same problem with my X-T2 when I was in India.Rendered the camera unusable. cleaned it multiple times kept it outside but no change.....but everything else was working fine...but after i reached back in the ME there was no problem ...even now its so humid (70-80%) outside that in 10-15 seconds i'm bathed in sweat!! but the camera worked flawlessly! no fogging up nothing.