Bird poo damages paint - always, It astounds me the number of cars you see driving around with baked on poo. IIRC it doesn't need to be left there for very long to start harmng the paint and metallic paint lacquer in particular. When removing it you must soak the area - I tend to put a damp sponge on top for maybe 5 minutes, otherwise the inevitable scrubbing/scraping action risks scratching the paint as the poo will have grit in it from the bird's diet.
In short, you should remove the poo as soon as you you see it - however 'silly' that might make you appear. In the past I have had the aftermarket paint protection and I would recommend it, it wasn't available in Aus though. Applying a quality wax polish can give your car some level of protection too.
Many years ago we left our (then) metallic silver 2004 Focus under a tree at an airport car park, came back after two weeks in the sun to a car with much bird poo and paint damage that wouldn't polish away.
I'm not sure the VW paint on theGolf VII is any different to that on other VW cars or indeed other manufacturers.
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