Playfield empty.
I have never removed all of the rear components before.
I cut away flippers, shooter and kickback components. The rest I carefully unscrewed everything leaving it in its current location.
I then used another sheet of board (roughly the size of the playfield) and with the help of my wife, slipped it in between the components and playfield. Closely mirroring where they are located on the playfield. I cling wrapped all the components to this board for attention later!

And remember  - lots of photos, from the top and all sides, going to help massively when I go to replace everything!

5 minute clean and here's what I've got