Hi Phil,
many thanks for the quick response. I think it is 'body salt' to be honest ! Ive seen a number of other i30's here exactly the same, unfortunately. I was going to fit seat covers when I first got the card ( new) but never got round to it.
Wish I had now. The marks are over 75 % of the base (drivers seat mainly) with little to none on the back which doesn't really make that much sense to me ? I was hoping someone maybe in WA was going to say 'yes me too me' and tell me what they did, but its early days yet I guess. I will approach a car de-tailer and also have a look at some good cleaners I guess. I'm always a bit careful these days of chemicals as they can melt down certain materials !!! Many thanks again Phil for your reply.
Mal