Turn up the gain on the mid or hi frequency band on the EQ section of a channel that has crackly pots, then pass some signal through the channel and drastically sweep the frequency control from low to hi (clockwise)...If you get a howling or squealing feedback type effect when you sweep the EQ frequency knob with signal passing, I suspect what your console needs is a recap. Sometimes the crackling/fitzing/popping is dirty pots, but they have to be really dirty...those symptoms are also brought on by DC current in the signal path. The DC current is often normal with opamp designs, but its supposed to be blocked by all those coupling caps in the signal path. When the caps start to dry up/go out of spec you start getting crackling or even the above mentioned feedback effect in the EQ section with drastic frequency sweeps. Do you have that problem?
I'm just trying to save you the time/trouble of tearing your console apart to clean pots and still have the problem.
If you really think its just dirty pots, try exercising them with a shoelace...pull the knob off, wrap a shoelace once around the pot shaft and rapidly sweep the pot from hard left to right and back and forth a bunch of times by pulling the wrapped shoelace back and forth. Does that help?
Ultimately if that doesn't help it may be time for a recap, or if you want to try cleaning the pots, to do it right you really need to pull the channel modules apart so you can get to each card, because of the problem you've already identified: the challenge to get to an access point to jet/drain the cleaner in the body of the pot.