When I worked at a computer store that did a lot of Amiga business, used Formula 409 spray cleaner to clean the Amiga's. That stuff worked great! It takes a lot of it and I would spray it on thick, but you could actually see yellow in the liquid that would drip down the side of a monitor case or A500/2000. There would be areas of clean almost new looking plastic left when it was wiped off, and it was even more noticable on systems that were owned by smokers. (Once has an A2000 come in that had a thick yellow sludge over everything on its insides....I honestly didn't know how it was running it was so completely covered)
