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I dug out some of my old Hot Wheels Tech Trax(pic related). The red one was always my favorite, but in recent years, it's not been doing so good. The car is suppose to bend up and down with a spring that keeps it level, but for some reason, the car is stuck in this hunched position. I took it apart and found that the axle that's used in its chassis for the gimmick is rusty. So I ask; what's the best way to go about removing rust from the chassis without damaging the plastic?