I've never seen that particular issue and I've looked at a lot of white Tesla seats. I know some folks are concerned with the new perforated ones staining and tearing, but I've never seen this particular issue on the old "vegan leather" cream or white seats. I'm just not sure there is any way to fix that other than have the seat replaced. Either it's a manufacturing defect or someone cleaned a vinyl seat with something not meant for vinyl, like maybe acetone, bleach, or ammonia...I hate to sound like a broken record this week, but if you are still under warranty I would schedule a service appointment.