Adcom GFP-555 II

I have from the outside pulling the knob and felt but still there. Do I need to go internal to do this on a gfp 555 II?

Whats a good spray? I will try again Thanks!

I appreciate all the input from everyone and will take the time to go internally with some tuner spray to see if this remedies the intermittent static at the listening selector switch. Tech3149 your saying the cleaning may be needed at the rear of the circuit board not directly into the manual selector switch behind the faceplate? I guess I will understand better what saying after I go inside.

I guess as jb52 recommended Deoxit maybe the Deoxit D5 is best?

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Thanks any desired pre amps for 2 gfa 555s with some big Polk and yamaha speakers you recommend?

Tech3149…Did the deoxit and no more static! Thanks … I see what you meant about the mechanical switch and slide ribbon now… bought this new in 1989. Not sure if I should use the main or bypass output. Is the sound much cleaner on bypass?