I'm not sure if it's been mentioned but buying a new shell is really the easiest way to go... how much is a new shell, £20 if that, do something that makes you £20 cos it will still be quicker than trying to remove the paint. Brake fluid can also weaken the shell, making it brittle.
Did anyone mention yet how much easier it is to buy a new shell....
Can you see a trend starting to form here ???