"Thank you guys, some great suggestions there"
 

Hi bigsquirrel,

There have been alot of suggestions, and to be fair-do have an instant result but it is still masking the underlying problem.

There is a company out there that have done extensive trials/testing/research in different parts of the world for many years, to not only address the soot problem but also UV damage to the paint itself. The name is Permagard and the webiste is below.

About Permagard

As part of the application process, there is the option of using an extremely fine abrasive fluid for paint surfaces that have considerable micro-damage.

Major airlines throughout the world now are also using to not only reduce downtime/extend cleaning cycles but is also improving fuel efficiency.

There is a number of video's also on youtube to look at.

No-I dont work for the company and am not a shareholder...just an engineer who came across this info a while back. Any company I work for or consult to, I always put forward as a suggestion as I think it is worth the small effort.

Something to consider :)

Swinging Spanner, thank you for that information
much appreciated. I hope others got some good
info from this thread also.

Cheers

BS