its also just sometimes people's hands (different sweat composition and stuff). in a past career i worked on car interior switchgear and there have been lots of studies done (and manufacturers spend alot of time and $$$ working around the problem) about the corrosivity of people's skin. women are the worst offenders by huge margins as well. between lotions, sunscreen, and nail length they DESTROY switchgear like you wouldn't believe. in this case i wouldn't blame the users above because the issue seems pervasive, but i use my window switches every single day and they look perfect. i also park in a garage and have at minimum 50% ceramic tint on every piece of glass. temp variations and sun damage affects the issue alot. if Ford decided to cheap out on the switchgear or went with a new supplier that didn't have a good resin formula... its gonna be an issue for sure.