Probably a mild solvent or detergent (simple green?) They get lots of grease soaked into them from hands (even clean hands have some oil on them from the skin).


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.