It must be nature because it isn't nurture.
Silence for too long from the bathroom.
'What are you doing?"
"Cleaning the bath. It really needs it!"
There she was, in the bath, happily cleaning the tide mark with our facecloth.
I can't think where she learned that from - I don't think she's seen me do it that often and I don't even think that Joyce, our cleaning lady, does it that much either....
Maybe all little girl's just love to clean - when they are four.