Pesach Questions

After we had kashered our kitchen for pesach the kids ate some Cheerios, and poured the milk and Cheerios that were left in the bowls into the sink. What are we to do? Do we have to wait 24 hours and then kasher again? This is our dairy sink (the meat one was untouched) Obviously everything was cold.

It’s fine— because it was cold there is no impact. Just rinse out the sink with soap and water that’s not yad soledet bo (use cold or luke warm water).