@lovemusic
I have several other projects in front of the Dual, so I'll go ahead and comment on how I plan to tackle it. Similarly to the receiver, the first step will be to remove as much physical material first (dirt, cat hair, etc) outside with my yard blower. Then, I'll remove the cover, bottom, platter and do the same once more.
At that point, I bring it into the garage and will use a 25:1 solution of organic cleaner to wipe it down with paper towels. This gets the loose dirt off and because there are no strong chemicals, I don't have to worry about getting it on sensitive areas like wood, lettering, etc. I typically only spray liquids on the paper towel, but if no electronics and a smooth surface, like the dust cover, I will spray it on directly.
Since this was in a heavy smoking environment, it will require some stronger chemicals to get through that nicotine. I use a citrus degreaser product on hard plastics and metals, but with caution as it is very strong. I keep it away from any wood veneers or light lettering as it will eat into it rather quickly. I did not have any problem with it on the front face of the receiver, lettering held up just fine with firm rubbing. That stuff takes the nicotine off instantly, very little effort at all. I then wipe it off with the diluted organic cleaner.
For the internals, I plan to take it apart as much as possible and scrub everything with a dilution of the degreaser to get the smell out and remove the nicotine. Using paper towels and a tooth brush, everything needs to be cleaned to ensure the smell is removed. Then relube everything once it is all sparkling again.
For the wood base, I only use the diluted organic cleaner all the way around. Spraying small strips of paper towel, I just keep scrubbing it until no more dirt comes off. Once I am comfortable I can't clean it any more, I turn my attention to fixing any veneer issues and polishing it.
If the dustcover is scratched, I plan to use some plastic polisher, like McGuires, to polish out light scratches. I have buffed out headlight covers before, so this could take a lot of elbow grease to get it back to "like new" condition. I can't really see through the gunk yet if there are any major scratches, but I hope to be surprised to find it in great shape like the Sansui case.
Attached are some pics of degreaser product I used and how they polished up the knobs. Also, one pic of the current condition of that Dual, going to be FUN!
