... I brush the same areas with a dry, soft-bristled toothbrush, which is one I have "retired from dental duty." No compounds, no liquid, just dry.
I have not checked their effects on the surface under magnification, but to my eye it does no damage. Others may chime in with their examination of the results using the same technique (this is sort of a "disclaimer," you know, like "your mileage may vary!").
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