Friction questions

I have two questions of friction :

1)Why is the coefficient of friction never equal to 1 or 0,but always between 0 and 1? What will happen if the coefficient of friction is EXACTLY 0 or 1? Please explain in some detail.

2)Polishing reduces friction,but too much of polishing will actually INCREASE friction instead of reducing it. Is it true? If so,why?

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