Depending on the raw, after you level the image (or rather, place an appropriate level or curve adjustment layer on top of your raw), you’ll still have several dust specks.
You could amp up the white leveling, but then your image begins to get over leveled and edges become jagged. From this point, it’s best to manually take care of the remaining dust.
The brush tool is your friend. Or enemy.
Regardless, it can be hard to see all the dust remaining on a page without giving yourself eyestrain. It can be especially challenging if the raw is actually huge and you’re looking few the remaining slightly off-white pixels…
And now, it’s very easy to see all the additional work you’ll have to do~ Time to zoom in and clean up! You’ll be able to be confident that you have eradicated all of the stray pixels~
Here’s my final cleaned version:
Dark adjustment layers are also useful in revealing some editing mistakes, like off-color brush strokes. Pretty useful.
Aside from a dark adjustment layer, you can make one for whites (slide the grey level to the left), which will help finding light pixels in places which should be black (like Ritsuka’s hair above).