so my mom barily ever washes her car, and when i did wash it for her, i found this mark (picture below) ... its been there for quite a while, im thinkin over a year ... i tried to claybar the left part of that picture that is showing, spend around 10 minutes on it but all it did was flatten it, and it doesnt seem like it is going any further ... anyone have any other suggestions on how to remove it? 

