I am guessing it's brake fluid tipped over top of wing with more running down the center.If a fluid was poured over it why does it funnel out upwards from the wheel arch
I have been given more info now though..lol
Just spoke to my son and found some more info. Lol
The white bloom is him rubbing the wing down with wet and dry.
The guy told him it has had something go on the wing........not what though. Lol
Judging by the fact it has has all new braided brake lines I am guessing it is actually brake fluid. The guy must have wiped it off and though that was it. BUT as I now know it eats into paint unless neutralised with petrol.