I put mine in the dishwasher all the time….got to be killing germs or our dishes wound’t be sanitary …
I don’t know if this is true. There is a difference between dishes which are are non-porous, and a sponge which is definitely porous. I wouldn’t think that the water in a dishwasher would be hot enough to kill “germs” hidden in a sponge, especially if it came out of the dishwasher still wet. Maybe if it dried completely between uses?