Good tinker with the wagon on the weekend. Pics for you.
Gave it a wash. Working on indicators at moment so that's why the front right is out.

Got the bulk of the caked on grease out of the engine bay, including underneath the engine and transmission. 2 cans of citrus based degreaser applied, left it for a while and rinsed off. Then sprayed some Aerospace Protectant 303 over the engine to give it a bit of shine. There's still a bit of detailing to go but getting the bulk of the grease out was the aim and very happy with how it turned out.
Before (photo from when it arrived):

After:

Did some further experimenting with polishing. As this vehicle will be a Preservation style example I have decided to keep the nics and scratches but remove any surface rust from them. Any deep rust however will be cut and repaired properly, there's bugger-all of that however.
Surface rust removed here with some polish. A bit of difference.

I'm liking the high gloss patina.

I should have the 140 steelies back from the blaster/painter this week hopefully.