Late 280Z Turn Signal Switch, a set on Flickr.
Here are some pictures from taking apart and cleaning a 77/78 280Z turn signal switch.
Before I worked on it, the switch was covered with lots of dirt trapped in the grease. I took off all of the screws to get to the switch parts. I then degreased the internals of the turn signal switch and the cancellation mechanism. I cleaned the copper parts with metal polish and sanded them lightly with 1000 grit sandpaper. I put dielectric grease on the moving parts of the cancellation mechanism and on the contacts.
When it was all back together, I checked the high/low beam switch and the turn signal switch with an ohmmeter to ensure the switches functioned properly.