Hi.
The blemishes appeared under my watch, although there has been only normally situations, clean environments, no unruly peeps in the car, etc.
In other fora for lexus, i have read other UX owners having similar experiences with the washi material. It seems to be particularly fragile to small grit scratching , so my conclusion is that rather than keeping the dash clean with a microfiber cloth , it is wise to use compressed air or a small dust bellows (like in old style photography to clean dust from lenses and negatives) and not wipe the washi parts. I will use a recommended non silicon leather cleaner conditioner to see if I can minimise the visual appearance of the scratches.
It is not blame, although I find it strange that a material that is this sensitive was chosen by Lexus. It is a shame because it does look very nice.