ok, be VERY careful... I have one too. (Mine arrived with one snapped foot, but i fixed it)
The goldwork are decals. They were originally covered with a coat of shellac, so Glenns advise is spot on. However, be careful not to get it on the seams where moving metal meets paint. I would use blue painters tape on ALL of the metal surfaces first, trimming the edges very carefully. then spray shellac, then let sit for about a week. Then you can attack the metal by using a compound like Brasso and a soft cloth (up to 0000 steel wool if really bad) to clean the shiny bits.
This is one of my absolute favorite sewing machine to use. stitches great!!! My favorite part is that it is the ONLY machine in my collection that the shuttle is driven by virtually the same mechanism as the needlebar, only mounted horizontally. BRILLIANT.
Congrats