C350Carl
Senior Member
- Joined
- Feb 16, 2014
- Messages
- 4,580
- Reaction score
- 898
- Location
- Middle East
- Your Mercedes
- BMW 740Ld xDrive
Usually they are industrial fall out. So bits of iron etc. Quite often if you spray Iron-X on the car and it starts turning purple you know there is a lot of crap on it! You also get tree sap, tar etc.
