Used the car quite a bit today, but when home I noticed stacks of tiny orange brown spots all over the car. No idea where they came from, and they are all over the place, so does not look like it was splashed from the road, or from one side. Got then on the front bumper, bonnet, roof, doors, and ever the tailgate

trouble is, each takes about 1 minute of rubbing with a wet cloth to remove, and there are still about 1000 to go.
Anyone know what the stuff it might be, and more importantly, how to remove them?
Bonnet

roof

Door
