So figured I'd post a write up on my clock cleaning and restoring as I haven't seen one done for the square Pontiac ones (Or I am just blind)

So I started by taking out the two screws from the back of the bezel and pulling the assembly out from it.

After removing that I flipped it over and removed the time set handle.  This proved to be easier said then done as it required multiple pliers and quite a bit of force. Easiest way as some of the members on here told me is to pull the set handle out, grasp the shaft with one pair of pliers, then using a piece of leather to keep the handle from being damaged, I used another pair to turn it and finally loosen it off.

After removing the handle and the plastic lens, which I polished up using leftover materials from a headlight polishing kit I had,  I carefully removed the second hand using a pair of needlenose pliers, then was able to remove the minute and hour hand using my finger nails, careful not to damage them.

After this you can just flip it over and unbend the four little tabs on the four corners to remove the faceplate and clean it.  Don't use any sort of solvent, it will remove the paint! I used eyeglass lens cleaner and a lint free microfiber cloth to clean mine.

Once that is removed there is three little clips holding the clock assembly studs that you can remove quite easily by lifting one side up with a small flathead screwdriver:

Once the are off you can separate the clock assembly from the mounting plate and finally get to cleaning!  On both clocks I did, they both had the same problem of getting a bunch of dirt jammed in the hour, minute, and time set gears which ride on top of each other. Also on both clocks the time set gear had broken teeth and so was useless so I had to remove the gears, clean them, then replace the plastic time set gears.

Then after cleaning the gears and replacing the plastic time set gear I cleaned up the contact pads on the coil and the wind arm, then added a freewheel diode to the coil to give the counter EMF generated by the collapsing magnetic field somewhere to go and in doing so, limit the spark generated so as not to burn the contacts as much.

After it was all done and cleaned, I lubed it all up with a silicone lubricant and then just put it all back together in reverse order.  When putting the hands back on I found it the best to align everything at 12 as just putting them on randomly looked stupid when the hour hand wasn't pointing at a number when the minute hand ended up on 12.  These clocks are pretty amazing little pieces of machinery and I was quite enthused at being able to work on one and it just goes to show you how well made they were as all the problems literally came down to poor maintenance, not poor quality.

Sorry for the excessive pictures, just pretty happy I got them going again, have had both running for about a week as per this write up.