Unfortunatley if the plastic has been damage by the sun or a strong chemical has been used on the painted side of the mirror to remove bugs etc, then there is not a lot you can do about it other than keep topping up with a trim restorer or replace the plastic housing
You can sometimes replenish plastics by heating them up with a heat gun, no I have NOT gone mad
But this only works on textured plastic so please DO NOT try this, plus you would know doubt scorched the paint on the plastic mirror casing.
But this is what you can sometimes get away with doing
And that’s magic
Thanks for sharing that tip Neil
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