I had posted a vid link on dry ice cleaning before but found this one a tad more interesting, with 964 engine issues thrown in for good measure. Apologies if you already know all about DW`s 964 Turbo story, but if not and you like this vid, I suspect you might enjoy going back to the story of the acquisition of his Porsche and take up the story from there..?
https://youtu.be/qv_-SuW5Nx8
https://youtu.be/qv_-SuW5Nx8