By which time...
I couldn't help but ask Ellie why she had put cream all over the window - she's usually such a logical child. Her response? "The window was a bit sore". Anyway, she helped Paul and me to clean it up, and little more was said about it.
Which was probably an error - as I realised over lunch, when I casually asked her what she should do if the window was sore again. "Put cream on it" she replied promptly. We chatted for a bit about this, and she now fully understands that it would be much better to tell Mummy or Daddy.
And the cream has been moved to where it should have been in the first place - far, far out of reach!