I use a car polish called 'Mer' on just about everything that needs a clean. Plastics, metals, woods, the lot. Very gentle, very easy to use. It was commended to me by custom bike builders. I used it on my own bike, and it migrated to my guitars. Also use the gibson pump polish, with a nice soft clean duster.
MB1.
Is it not the "Mer " that takes out the fine scratches and revitalises dull or faded paintwork?