Bernd,
For most parts he cleaned and polished them but zinc plated a few. To be honest, I left it up to him to decide, he is very detailed and so far has shown very good judgement in restoring the car. We had a bit of a set back recently when a spring broke when working on the soft top frame and it scratched the paint on the side. The car was just repainted this week and I hope to finish it some time this week or next.
Mike