Use whatever tool you prefer to handle the last couple of remaining spots to achieve the final result shown on the right.
of this tutorial shows the effects of applying the presented method to a color
photo and compares the results with the "Dust & Scratches" filter. It also highlights the larger loss of detail and unwanted artifacts caused by the "Dust & Scratches" filter in comparison to this approach.
From Quickly Remove Many Small Spots/Speckles Without Healing Brush or Clone Stamp