Greetings;
be sure to unplug unit and wait an hour or so. I would first grab a 1 wide inch softer paint brush and your vacuum hose and brush off the dust and let the vac capture the dust bunnies. hook up the vac brush for interior walls. make note of all wires in case you remove something like the TT section.
Deoxit isn't a general spray all cleaner, it is for the i.e. volume, tone and balance pots that you spray 'sparingly' into the slit on the body. usually you can see that clearly on these old units. You may need to pull the TT and use some vcr type lube/grease for the moving parts again sparingly. If equipped with a tuner and tuner cap.. do not spray anything on the that. A small shot of deoxit5 on the tuner shaft bearings only is okay.
just take your time.