This time of year we do a car wash as one of the centers. I'd been "saving up" my Voyager van for some weeks; it was dirty enough that the kindergartners had no problem seeing what needed to be done.
It came out shining clean. We're tackling the principal's car tomorrow morning.
And, although it NEVER rains in California this time of year, I hear we're supposed to have rain next week. So...we'll see...we may not do this center in the rain.