A general all purpose cleaner will remove any water spots, but if it’s chemical residue (where someone has cleaned it with something that’s etched into the plastic) then bit more thought needed...
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Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
&
RM Performance http://www.rmperformance.co.uk
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