After driving 500km to Essen for corrosion prevention by application of Mike Sander's anti-corrosion grease, I gave the Miata an inside out thorough cleaning, including a claybar treatment of the paint and subsequent acrylic sealant! Now my shoulder hurts from all that polishing, but the car looks like new from the outside and is all nice and grease covered from the inside!
You can see some pictures of the anti-rust treatment in my article on the Mike Sander's grease.