I have a can of Radio Shack tuner cleaner you can have.. It needs a spray nozzle, though. If it were me, I'd replace the caps I could see and recognize with good quality like-values and do a thorough cleaning of the contacts and pots first. If that doesn't work, then go to a specialist.
This particular unit has a lot of oxidation on the input jacks. I think there is some potential. The thing is, it's just a drop-in receiver with a tuner and phono pre built-in... So, I was thinking it'd be easier to buy a working McIntosh receiver that I know Alex already has... with the the money it'll take to fix the Scott. Alex may even have a reel-to-reel you can add.
I can help out if needed, just let me know.
-C