The Lifespan of Yarn Graffiti or How does it disappear?

As you might know, personal priorities differ in relationships.
Saturday morning at the breakfast table.
My husband says: "Oh, as I see you knitting, that reminds me that I also spotted some yarn graffiti yesterday, at the traffic lights when I picked up Clara from kindergarten..."

Me: "Thanks for telling the next day."

- no picture -

(all gone by today)