Thanks for the replies, that's a lot of help. I'll mark the topic as answered now, as per forum guidelines, but if anyone else wants to add anything please feel free.

I have a Roland D-50 and a Yamaha DX7 IIFD which could do with a really good clean on the outside. Both synths have quite a lot of little spaces on the surface where dust and grime can gather and I'm wondering what the best way of getting them back to 'as new' condition would be. I've searched this ...