Ok .. Update.
Took the car into the paint shop and the guy said its almost certainly nitromors.
If you look carefully at the damage you can see a matching half circle of discolouration on the metal work. Looks like I got it off before it got down to the metal.
As mentioned above liquids do tend to pool between the spoiler and body.. Particularly if you park with the nose lower than the back as I do.. I think this is why it had focused the damage on the one spot.. Burning into the plastic faster than the bodywork.
Thanks to everyone for their input.
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