well start with 180 grit sandpaper the go to 220wet the 330 wet and sand until you get to somehwere around 2000 grit then polishing compound if your up for the work
if you use soda watch getting it in seams where 2 metel over lap like where door skins trunk skins come together if you don't get it all out and it gets wet it can swell and in some cases rip the metel apart so be careful