The difference this time was shaving cream, which always makes things more fun.
I filled a tray with shaving cream and a container with water, and I set them side by side on a towel (with extra towels close by). I had Love Bug pick out a bunch of small cars to wash.
The boys put the cars in the shaving cream and then into the water. Sweet Pea especially enjoyed dropping the cars into the water from high up and making a big splash.
Eventually they got sponges involved, we continued to add more and more shaving cream, and Sweet Pea had fun just sticking his hands in the shaving cream and smacking his belly so the shaving cream flew all over.