Bio enzyme is safe to use for all kinds of materials. However, in case of earthen cookware you can reduce the dilution. Use 20 ml dishwash in 100 ml water as the material is porous, apart from this there are various points to take care of while washing it. Sharing a link with you for the same:
https://mitticool.com/best-way-to-wash-clay-cookware/#:~:text=Let%20the%20cookware%20soak%20for,brush%20or%20nonmetallic%20scrubbing%20pad.