Clean and inspect it regularly, like the rest of the fleet! You would imagine that there was some laquer or varnish used but there aint. All the fleet started out that shiney but the surface of the alclad dulls with time due to oxidation. It is in fact a very thin layer of surface corrosion. To shine one up you basicaly remove this thin layer of oxidation. If you did it often enough you would polish your way through the skin though! That is why AA doesn’t do it every week. This finish will last a few years but will be slowly revert to the same dull silver as the rest of the fleet.
I wonder what colour the AA plastic pigs will be?

Rgds Cking