Hi Graham, It is not just chemicals in Teesside, but also a major steelworks [which I know very well] with the largest Blast Furnace in the UK. Add to that, there is the coast and if it lived close to the coast the car would get a good sandblasting when it is windy. I would look for a good detailer --- they are often mobile -- and get him to do a professional job. Regards, Peter.