Despeckle should be one of the first things you do if you have lots of white or black spots. There is also 'Descreen' in Gmic if the spots seem to follow a pattern. I have even used it to remove a flyscreen.
You may also like to use the wavelet decompose to remove areas of noise etc. Be careful not to remove your photo details though. I very rarely use this but some people swear by it.
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