Joey - Phosphate finishes are fairly fragile and I would not suggest any kind of abrasive media if you want to preserve the original finish. If they were mine, I'd soak them in EvapoRust and check them every hour or so until they are just clean enough.
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Steve Nuwer
1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored
1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project.
1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project
1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD)
www.2ndGenZ.com
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