How to reduce noise when there's only black and white?

Hi all,
Total noob here, I've searched all over the place to no avail (or I just didn't know the correct term), but how do you do that?
Basically I'm trying to just extract lines and texts out of it, and filtering and exposure did nothing for me.
As you could see below, the "gray" color was made by dots that are completely black. Is there any way to do that?
Thanks so so so much in advance!!

You may want to try Filter > Noise > Despeckle, then move to Curves and slide the highlight end of the scale a tad to deliver pure a pure white background.

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