Help: Cleaning Old Metal Body

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I got this nice Monogram kit for $19.0 all in all, car body and other parts are metal but what is this substance that developed on body ? rust ?

I hope to find some advice from someone who had same situation, the surface is still smooth but I can't tell if painting on it is a good idea. Also I'm afraid that scrubbing or sanding might leave scratches that will ruin the paint job.

Kit:
scalemates.com/kits/..ogram-6101-56-t-bird

thanks

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