Advice on paintwork

#1
Chaps, I have a 2003 Merc C180, was my company car, now I´ve inherited it, the wife likes it, so I´ll probably keep it. The only problem is that it was parked for a long time in an underground garage and something nasty has dripped onto the bonnet, leaving a sort of matt black piss stain. No amount of washing and waxing seems to improve the finnish. Short of having a complete respray, any suggestions on how I can sort this problem?
 

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