I cleaned the armature by putting it on a drill and taking 600 grit on the contact surface to clean it up.
Cleaned out all the old gunked up grease. It was more like paste.
I replaced the brushes. They looked like RC motor brushes. The RC motor brushes are a hair too wide. I sanded them down enough to fit and move freely.
The white nylon gears were flattened on one end. I dremeled the grooves and any flat spots on the gear.
Re-greased, re-assembled.
Tested the wiper without any load "No arm attached" It did not look too promising.
For those of you taking apart your wiper, don't lose the nut that secures the arm. I believe it is a M8 1mm and not the usual M8 1.25mm thread. Mine was missing in the first place but now I have to order one.


Gear and brushes

Gear before

Gear in process

Gear finished