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Just because... try softly buffing it with a whitening toothpaste on a damp cloth or papertowel. Don't be overly aggressive, because the toothpaste is mildly abrasive. Then buff with a dry cloth.
This worked fairly well for me with some "blueberry stained" bird poop.
Good Luck,
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet! 
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