I use LMG polishing cloths. I usually start with 3600 depending how bad the orange peel is. Then move to the next highest grit. 4000, then 6000 , 8000 , then the final 12000.
orange peel is like a mountian... it has peaks and valleys... when you start sanding the peaks become dull and the vallyes are still shiny. when you get to where there is no shiny spots left the paint is flat .. then you can procede to the next highest grit. that grit takes out the scratches the previous grit made... 6000 takes out the 4000 scratches 8000 takes out the 6000 scratches etc. till you get to the end 12000 and there are no scratches left.. and you should see shine. then you can use a good plastic polish , or wax to shine it up and protect the finish.
Hope this helps... oh.... I use Novus 3 part plastic polish