Hey Paul, what kind of condition is the paint in? Does it have swirls/scratches in it? If it does, those need to me removed via machine polishing to get it back to looking new.
From there, to enhance the shine you can apply a glaze and/or wax to not only get it back to showroom-new condition, but better than showroom-new.
From there, to enhance the shine you can apply a glaze and/or wax to not only get it back to showroom-new condition, but better than showroom-new.