Just remove the the bolts that are on the inner "FENDER" and the side marker "SIGNAL LIGHT" Remove the screws on the under side of fender that hold the "WHEEL WELL COVER" and the few bolts behind the joint where the fender and the door meet.
It is alot of work this way. You may want to just remove the wheel well screws and accesse the antenna from there. You will also be better off if you remove the wheel so you will have more room to work. I personally dont see why you cant go thru a carwash. The antenna will not break off that easy.