I undertook a full restoration of the beige coloured audi S3 interior which is in my Mk4 Golf GTI. It is not for the faint hearted this process is extremely meticulous and should be performed with more than adequate lighting and ventilation, that said, the results were incredible. Unfortunately I only managed to restore the front seats due to the amount of time it took to do but the back seats are stained and in need of attention soon, if they come out looking as good as the front ones did I will be more than happy, my only real issue is that my front seats are beginning to look like they need doing again, it's been about 4 months now since I restored them and I haven't used any leather cream of protector so I suppose that is to be expected. It is likely that I will