My son is in primary one and without fail, every day he comes home from school monumentally filthy. His trousers are thick with mud, chalk or paint, his socks and hair are full of grass, he has something unidentifiably sticky on his jumper. Literally everything is having to be washed after every wear. He usually also has some kind of mud on his nose and pen all over his hands.
I don't mind particularly, he's leaving the school gates cheerful and having had a great day, but is he uniquely grubby or is this just what primary school children are like?!