Lots of elbow grease tonight with Scotch Brite and wet and dry to prepare the frames,
I am quite pleased with the results.
Also logged my first support email! There are some stubborn bits of loctite or similar where the horns have been attached to the frame. Not sure how thorough I need to be in getting rid of them.
I have also cleaned down all the other parts which comprise:
Buffer beams, buffer stocks, cross ties, boiler support and the bushes for the motion
A couple of dedicated freezer boxes have been allocated to the project for parts.