For most exteriors, I recommend a damp microfibre cloth and very mild detergent/water mix as a starting point.
Be careful with older gear. Sometimes fascias are printed with water-soluble ink, or ink that has become fragile over time. Solvents other than water, and even just water, can remove fragile ink. Also, be very careful with turntables. Styluses and microfibre don’t mix well.
Wood exteriors can be cleaned with wood soap and then oiled or waxed, as needed. I like to use O’Cedar oil for many kinds of wood, beeswax for some others. How do I decide? I don’t know but one gets a feel for it.
Interiors get a little more technical. There are electronic parts, high voltages and one must be very careful not to damage anything. Compressed or high-pressure air is always a good starting point. I use a cordless blower to clear big dust from many pieces.
From there it gets more involved and I generally recommend booking your equipment in for deep cleaning. I’ve developed deep cleaning regimens for hi-fi electronics which work very well. This involves high-pressure air, chemicals, solvents, water and a drying oven.