If it is automotive paint, most likely, treat is as you would a car. Dish soaps strip the wax off. Any good auto wash will do. Personal preference here is the Meguires in the pink bottle.
You bet it needs waxing. How often depends on the quality of wax used. Buy a cheap cleaner wax & you will need to do it more often. Buy a high quality, & usually expensive, sealer wax & you won't need to do it so often. What is your time worth? Less than the cost difference between the two?
Sooner or later that unit will be for sale. A bit of effort & good product adds thousands to its value.