Not Quite the Answer I Was Expecting

I had already washed N up and had taken her out of the bath, but G still needed some "bubbles" and a final rinse.
"Alright, G, let's clean under your neck and get rid of the dirt."
"Where are you going to put the dirt? In the water?"
"Yup, in the water."
"There's already dirt in the water."
"Where is it from?"
"From that white thing."
"White thing? What white thing?"
"That white thing that you use to clean the toilet."