Just detailed the car today, spent 7 hrs on it and its looking good again.
I used the foam lance, which might I add is a genius invention with VP Snow Foam. As I then rinsed off the foam I noticed lots of little black specs which I though, ok thats tar I'll get rid of them, but then there were bigger splashes and this time they were silver

I really dont know what they are, they didnt look like the normal tar marks and they took a hell of a lot of elbow grease and tar remover (I used halfrauds tar remover as my autosmart tardis is at my sisters).
Anyone seen these before and what are they and any ideas how to prevent them ?
Also, I would have thought that with a coat of jetseal and 2 coats of wax the car would have been protected enough for the tar marks and these silver marks to come off a little bit easier ?