I do not know how they did it at the4 dealership but when we picked up our new Cardinal a couple of months ago, there were scratches on the corian countertops. First trip back to dealer to have some missing items and warranty repairs done, they "buffed" out the scratches and it appeared they used some kind of paste very similar in consistency to toothpaste. Made the countertops look brand new and very shiny again. Very pleased with results and I plan on going to Lowes or Home Depot to ask if there is a product they have available to use on the corian! It exists but I just have never seen it done.
2016 F350 SRW King Ranch Dual Cab Auto Powerstroke 6.7
2015 Cardinal 3800FL Lippert Auto Level 41'