Is there anyway to fix this?

[Lux]

Corrosion on the surface could mean corrosion on the splines beneath it which attach the arms to the motor. Don't bother playing doctor dress-up and just replace the arm altogether.

Originally Posted by BEEF

the wiper is ribbed (there is a propper word for it but it eludes me)

Splined

[WeeYari]

Originally Posted by Lux

Corrosion on the surface could mean corrosion on the splines beneath it which attach the arms to the motor. Don't bother playing doctor dress-up and just replace the arm altogether.

WTF are you talking about!? I have never seen spline corrosion on any wiper arm that exhibits this common problem of paint blistering on this part of the arm.