Someone I know and trust opened up a dry ice and detailing facility near me. The owner is also an experienced mechanic specializing in German machinery, a big plus. He's also a fan of the 500E in particular. So it was off to the races.
Attached are some "before" and "after" pictures. You can see we took the trouble to remove the plastic panels, exhaust system and heat shields to access those recesses and hard to reach spots.
One can contemplate the undercarriage parts and body modifications exclusive to the 500 E, now that you can see them so clearly.
For the moment, I have decided not to treat or coat the cleaned surfaces with anything. I looked at other cars which had been treated, and even the most subtle coatings seemed to change the sheen of the parts to something a little too shiny for my taste.
Regards
Will