It must take a lot of salt and time to corrode any aluminum bike parts noticibly. My frame has a raw aluminum finish and has shown no sign of anythingf after four winters. I once had a V-brake noodle corrode out on a bike I never washed. That's about it.
Oddly, the one place my bike has visible corrosion is on the top tube where sweat dripped on it when I was riding in indoors on the trainer. Yuck.