Here's some tips for cleaning any console:
1. CLEANING KNOBS, CAPS, FASCIAS, pretty much any of the cosmetic stuff - Use a cleaner called Greased Lightning. You can get it at Home Depot. Soak the items in the cleaner (undiluted)for about 2 minutes. Then rinse with hot/warm water. This will take off most built up dirt, grease and grime without any scrubbing. Then put them in a towel and shake vigorously to get them nice and dry. NO NEED FOR A DISHWASHER.
If you put this in a spray bottle, then you can use it to clean the metal work of the console. But you will want to go back over the metal with something like Cinch by Spic n' Span to get it nice and residue free.
2. HOW TO CLEAN SWITCHES, POTS and FADERS (High Pressure Air is your friend) - Switches are pretty easy. most of the time it's just dust build up on the contacts that cause them to be scratchy and make your audio intermittent. First, use High Pressure Air (around 90psi is what I use) to blow away any standing dirt and debris. The best lubricant/cleaner is not Caig or Deoxit. It's Tefrawn by Frawn. Only there is one catch here. They don't sell it anymore unless you buy it in very large quantities. So if you can't get your hands on it, then I guess your stuck with the other stuff. Most switches have a small hole in the housing that makes getting the lubricant on the contacts very easy. Blow the switch with air one more time to get that lubricant all in there and then work the switch a few times.
Pots are a little more troublesome - First blow away excess dirt and debris with air. To clean, use a good contact cleaner, such as "Contact Cleaner II" by Techspray. But be aware that this will not only dissolve the grime causing that scratchy sound but also the grease that give the pot its "feel". If you work a pot right after spraying it, then you will work out all that grease and make that pot feel very floppy. I suggest that you spray with contact cleaner --> clean pot with toothbrush --> blow with high pressure air --> then work it out if it still has any scratchy. Pots do vary from decade to decade and some are more resilient than others. So these instructions are very general.
Faders - To clean slide faders, use contact cleaner and air to clean them up and use a small amount of your lubricant to get them riding smooth again. (Again these are very general instructions because there are many types of faders and the approach to cleaning them will also be different)
It's also wise to touch up all suspect solder joints - XLR, 1/4", Switches, Pots, Ribbon Cable Headers, etc
If you pay attention to detail, take your time and be willing to put in a little elbow grease, you can really make an old board look like new!