Ben tried to clean it up (and to his credit didn't do a bad job for someone his age.) He didn't get it anywhere outside of the bathroom and even in there it was pretty contained. The diaper was in the trash and all the tissue was in the toilet. There were some remnants on the floor, and the toilet seat, and a few spots on the wall. I threw the bathroom rug in the shower and Ben in the washing machine and wiped up the rest with Lysol surface cleaner.
The best part was the first thing he said to me this morning. "Daddy, I pooped! But it's ok I cleaned it up."
For all of you who are freaking out right now and getting ready to call child services: My child is healthy, well cared for, and smarter than you so don't worry about 'saving him' from your unfounded concern.