++ for magic eraser for the ball trails. Not sure about the bit above Indy - try Novus and if there are still marks try magic eraser (but carefully carefully!). I used isopropyl alcohol to dampen my erasers.

With the metal parts I started by using Brasso on them which seemed to work well. I then got lazy and chucked a heap into the dishwasher and this seemed to clean them just as well. No doubt there are other techniques that are better but I could tell from wiping the ramps and other metal parts aftwrwards that at least the superficial dirt had come off.
Don't forget to clean the under playfield ball tunnels too.

I'm doing things in the reverse order to you - done the playfield and now have to move onto the cabinet which scares me!

Send Garrett a thank you email at mrglee@yahoo.com, I'm sure he'll appreciate it. No way could I have done the shop out without his guide. He is also the one that worked out how to get the frog bonus so he's a bit of a legend in my eyes.