Oball toddler toy, how the heck do I clean this?

SuZi
I didn't think it through and I submerged this in bleach water to sanitizeit, the water got stuck in the center tube. It's been slowly draining out but I'm afraid it's going to get mildewy, does any know if there's a way to get the tube out? And maybe a better way to sanitize it next time? Thank you for the help!