Can sodium hypochlorite soak all the way through an unglazed ceramic cup and bleach blue paper wrapped around the outside of the cup?
It is not the ionic properties that control the diffusion. Diffusion is a fundamental property of molecules dissolved in a liquid. A bleach solution stored in an unglazed container can potentially diffuse to the wall. The pore size of the material will mainly control the rate of movement of the fluid (viscosity, surface tension etc.) If the pore size and the connectivity channels are very small it will take ages to wet the wall under atmospheric pressure.