Can I spray deoxit on the shaft and potenteomiter after removing the volume knob or do I need to remove the cover and spray it directly on to the potentiometer? Ihave no eelectronic stores in my area. I don't think Wal-Mart or lows sells deoxit. EBay sellers take two too three wweeks for delivery. Something to do with mailing products such as deoxit. Is there something i can buy at lows Wal-Mart or the Like? Is the contact cleaner sold at radio shack ok to use on scratchy knobs? All suggestions greatly appreciated. Thanks again my friends.