Son of the chimney sweep...

...because, well, what do you think of THIS:



Also (for detail):



As a reminder, this is what he looks like normally:



No idea where's been (OK, possibly under next door's van) or how to clean him - have tried with a wet cloth, that has shifted only some of the muck. I mean, my mostly black cat is always immaculate. Trust the mostly white one to come home covered in whatever (not the first time it's happened...).

Also also - the neighbour tells me that he's best friends with their DOG. Yes, you read that right. Fair enough, he's probably bigger than the dog, but still............!

Also also also - apparently, he *plays* with squirrels.
I rest my case. :)