In many cases rotating multiple times across the affected range of the potentiometer does the job. I find that spinning fast multiple times seems more effective than slow. It may need doing a number of times. If cracking very loud in so doing turn off the power amp while doing that to avoid any risk of damage to speakers. Using track cleaners can certainly help, but I suggest may be best only as a last resort - I would only do if I couldn’t clear the multiple spin method wasn’t improving it any more, and depending on the pot, is not always easy to apply.
Most often the cracking affects somewhere outside the range regular rotation, and can happen all the more if the knob is rarely moved at all.