I think it's concreate, it appeared I *think* after I parked in an underground car park.
You say you found it after you parked in an underground car park?
Most car parks are built of concrete, and I think what you have on your wing is the result of water dripping from cracks in the concrete. The water drips are likely to have a small lime content in them, and the marks left are sometimes refered to as 'lime weeping' or 'lime leeching'. Going back to my schooldays, this is how stalactites are formed over many years. If you have ever gone into underground caves, you can often see long white 'spikes' called stalactites hanging from the top of the cave where water has dripped which make a 'stalactite' on the ground forming where the water drips. The two eventually meet.
If this what you have on your wing, which I think is a strong possibility, then it needs to be removed asap, but from the length of time you say it has been there, I would say it will have had the same effect as leaving bird shite on your paintwork, and will have eaten into the surface of the paint and will be a swine to remove.
What to use, I wouldn't like to say.
However, if the mark left is similar to that from bird shite, there is a technique where they can be removed by the careful use of a hot air gun which in effect softens / melts the lacquer slightly causing it to 'run' filling the affected area laquer. No amount of cutting will do it. There are YouTube clips that show how it's done.
You need to be a braver man than me though!
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Topic: Wet Concrete on paint? (Read 3931 times)