Someone in my kitchen washed my Parve knife and Woden cutting board with a meaty sponge that was probably recently used. I don’t know what temp the water was but I assume hot. Are they both meaty forever now?
They are not meaty now. The reason being that the sponge even if it did get hot would only be a kli sheini, and b’dieved we will say that a kli sheini doesn’t make things trief. Aside from this the sponge most probably had soap on it, which would make any taste imparted from the sponge nosain taam l’pgam, together with thefact that there was most probably not much real milk on the soap at the time. Please see the following post where a similar question was discussed https://dinonline.org/2018/04/10/washing-meat-utensils-including-knife-in-dairy-sink-with-dairy-sponge/