The original bath paints recipe, found here at Pepper Paints, calls for dish soap. Instead, we used bargain basement baby wash, probably about 1/3 cup, 1 heaping tablespoon of cornstarch, and liberal amounts of food coloring.
The boys mixed up the paints while Junie B. finished up her schoolwork for the day. (Those are baby food containers--I had thought, foolishly in retrospect, that there might be leftovers, and the covers that go with those little tubs would come in handy. Oh, well! At least I was prepared!)
Next, the kids donned their swim suits and hopped in the tub! (Oh, please ignore the ugly 1970s gold tones and the questionable caulking job. Remodeling help is on the way.) I let the tub fill as they played, making a (rather murky-looking) bubble bath for them to clean up in. (We call this a "swim bath," by the way. When they were all a little bit smaller, I'd suit 'em up for a bubble bath whenever they were especially...involved...in a messy activity. With them all standing, this still actually worked out pretty well!)
Of course, they found their own rinsing methods, too!
This was a great way to spend a rainy, cold afternoon--cheap, clean and fun.
My kind of messy activity! :)