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Sometime over the next week i am going to be flushing out my coolant system and adding new anti-freeze but at the moment my header tank looks all orange and horrible, whats the best cleaner/chemical to bring it back to its origonal "new" state?
The plastic itself can become discoloured over time if its not properly maintained, in which case you will need a new one if you want it looking pristine again. Lots of plastics become "yellowed" over time, for example if you look at (especially older) microwaves and ovens, they will become badly yellow if not cleaned. I think heat must accelerate the process.