I guess if all else fails a repaint may be in order.Here you can a can of paint call 'Applience White' white is a white,I wonder if theres other colours.Also I work on a lot of Citroen cars and thanks to there plastic panels some of that knowledge may work here,do they make special paint for the Citroen so if it is the same plastic as the ST I guess it would work.Even better 1 of the colours is a off white sort of beige that whould look ok.