Is this dust? how do I get it out?

Hello I have this record that appears super clean but up close there is this section that has white dots that’s only visible when the light hits it. When the needle goes through it makes crackling noises. I have tried to wet clean it at least 5 times and it won’t come off.

Is this debris that’s stuck there very well or is it a pressing defect. Would an ultrasonic cleaning fix this?