We tried this craft origionally at a play group and I was pumped! The supplies are minimal, and likely already stalked- although, I did need to purchase the Ivory soap, as it isn't our usual brand. And it was really easy to clean up! I just dumped my kids in the bathtube and they got to continue their play there.
If you are using the paper towel and the spray bottle, a little bit of water allows you to mold the mixture into what ever you want. A lot of water.... well you can imagine that way is a little messier! The kids loved the slimy feel and the bubbles. This is definately one that I will be doing again........ as I still have 8 bars left!