From what I gathered, I think I have dirty pots in my GK 600 head. My question is, can I clean them without having to take apart the whole head? I've seen a couple videos of people just spraying the dial where the knob turns and it seems to clean it up. Or should I remove the whole casing and clean the underside of the pot inside the head? I'm new to cleaning these and would like the best result. Also, I actually haven't tried it yet, but is there a proper way to remove GK knobs from the head? Is it just kinda tug n pull on it and hope for the best? Any input is appreciated, thanks!