My first reaction was to yell but instead I took a breath and said. This makes mommy so sad. This is really important and special to me and it's not to be drawn on by Callie. I tried to explain why it's so special and I'm not sure she understood but I do think she understood it was wrong and I didn't yell ! Parenting win? I think so. I then made her clean it up. We spent quite some time scrubbing it but I was able to get most of it off. Phew!
So we took a swim to cool off both mind and body :)