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Removing scratches from piano black speakers

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Depends how deep the scratches are and how thick the black coating.

First of all before you polish  clay bar this with a medium grade clay  bar this will remove any microscopic contaminant's and slightly reduce the scratches. Then you could try with a fine compound like Menzerna FG or Maguires compound. But make sure to use a brand new pad on the polisher. Dual action are not as cutting as a circular polisher so don't cut in as deep or cause burning. 

Go gently bit by bit until the scratch is either gone or you loose the bottle to go further. polish with Maguires polish and then wax with Maguires gold. If they don't come out they at least will be a lot less noticeable.

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