Hmmmm it was just the other day I noticed the same I think (well, front-mid passenger side)
![confused :confused:](https://www.mk5golfgti.co.uk/forum/Smileys/newsmileys/confused.gif)
It was only the size of a two pence piece, but the block paving was spotless till then.
I cleaned it up and I have not seen anything since (either on the drive or in the garage)
I'll keep an eye on it now
![scared :scared:](https://www.mk5golfgti.co.uk/forum/Smileys/newsmileys/scared.gif)