Anyone notice how hard it is to get the aluminum trim clean on the bottom around the RV ?? Anyone have a proven product they use to get those nagging black streaks on the aluminum clean ?? The only product I know of is a cleaner wax and that seems to work, but thought I would throw this out there for someone that has a better method. I just washed my rig (in the rain) and the Gelcoat is clean but the aluminum needs some work. Thanks in advance, Bobby A