Hey Moto: I can't help too much about the PCB.. I know that the guy who restored my 2 4000's, soaks PCB's in a mild acid solution to clean the gunk off. That approach may more trouble than you want to go through tho....
As for the case, I would recommend the Windex / Magic Eraser bit... but also a product called Novus Plastic Polish, it comes in 2 grades, available from a company here in the US called Micro-Mark.. I think it's
www.micromark.com ... This stuff has done wonders for my C-128's and Dreamcast systems...
