Are twisted lugs scratch magnets or was I just careless?

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Hi, all,

After I recently cleaned my previous generation speedy racing with a soft toothbrush and dish soap (contains baking soda), I noticed some "swirlies" on the surface of the twisted lugs. I examined them with a magnifying glass and the amount of swirl marks was astounding. They were all hairlines and nothing deep, but still I couldn't believe how much swirlies those lugs had picked up, as I thought I had been pretty careful with the watch.

The brushed surfaces, however, were pretty much pristine except for a random hairline here and there.

Is this normal? Or did I manage to scratch those lugs with the baking soda?
 
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4 years of frequent daily wear, no scratches or marks on my lugs.