[purplerabbit]

Sponge bath lying down in insulated closet is safest option

[readyplayernull]

Even better, there is a way to avoid every risk and save water...

[lucioperca]

Let me tell you about the flesh-eating bacteria living in your sponge. You better microwave it beforehand.

[k8sToGo]

There is a chocking hazard with the sponge.

[diggan]

Attach it to a 10cm long string with something wide at the other end, so in the event of accidentally swallowing it (and ignoring the "why/how"), you can just pull it out. Problem solved.

[maicro]

Just make sure to not leave it in the driveway and it'll be fine.