I strongly recommend using a vaccuum with soft-bristled brush head on it to detail the dash, especially areas like the radio/AC controls, AC vents, shifter console, etc. Nothing cleans off dust better. It will very easily and quickly get all the dust from between the buttons, vent grilles, etc. ... all the places you can't normally get into. If you use something wet, then the dust makes 'mud' which gets into all the nooks and crannies and sticks in place when it dries. Use a vaccuum and it will look like new. After vaccuuming I will use a micro-fibre towel lightly dampened in only water, to remove greasy fingerprints, etc. that the vaccuum can't get.
Use something very soft (not paper towels!) to clean the clear lens of the instrument panel to avoid scratching it.
Wax the wood. Seriously. It will look and feel as smooth and shiney as new. Don't get wax on anything else.