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One little tidbit that I have recently ran across:
Ultrasonic cleaning with Zep heavy duty degreaser that you can get from Lowe's (full strength)
Left rear door lock mechanism (before):
After cleaning (about 1/2) in the ultrasonic machine with heated full strength Zep industrial degreaser, rinsing and coating with WD40 until I get back to it tomorrow:
My cheapy ultrasonic cleaner from Harbor Freight