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Google {Fourier transform plugin photoshop remove pattern site: photoshopgurus.com}

Simple smoothing / blurring is not sufficiently selective.  If you apply strong enough to get rid of the dots, it blurs  important features too much. There are ways to use simple blurring multiple times each shifted by a small amount, and that is not too bad. That generally accepted method is the Fourier transform method, but it is a quite advanced technique.

HTH,

Tom M