The front wiper mechanism on my 1988 Porsche 944 has become a bit slow moving and I plan to fix it. On my car the wiper crank arms go through sockets in a frame, the crank arms are moved back and forth by linkages attached to a motor.
I plan to remove the whole frame from the car, remove the retainer clips holding the crank arms, clean the sockets and arms, grease them, and then re-assemble. I'm not sure what grease is best to use for this application, I have silicone, lithium-12 and copper grease available.
I plan to use silicone on the linkages (3 and 5 on the schematic) and where they pop onto the crank arms.