I'm hugely sorry I'm posting Mercedes stuff on here, but I'm seeking quick help.
Today my mum asked me to take the car down town and check the tyre pressure. It's a 2 minute trip but since I don't have a drivers licence and don't drive cars on daily basis I quickly agreed. As I was pumping the tyres up a bit at the petrol station, I've noticed chewing gum like rust or decay. It has a chewing gum like texture but I highly doubt it's chewing gum.
I apologise for the huge photos. 13 Megapixel camera does it