I have a set of dishes that are dairy, and have not been used in over four years.
The were used a long time ago for Dairy. These are china dishes with a glaze over them.
Can I convert them to use instead for meat.
If the dishes have become dairy, i.e. they were used for hot dairy foods, they should not be used for meaty.
This is for two reasons:
1. It is not possible to kasher china dishes, because they are considered “cheres” (though there is room to debate the status of modern glazed china dishes).
2. There is a custom not to convert dairy dishes to meaty.
Even after the passage of time, which can be a factor in kashering dishes, the dishes should therefore not be used for meaty foods.