Jessica Romeo Ceramic Hard Skin Remover...how do I clean it?

[Little Miss X]

Hi, I have used my Romeo Hard Skin Remover on one client only and found that alot of the dry skin is still on! I did the course a while back and dont remember how to clean it so that the dead skin is removed and then sanitised for my next client. Can anyone help? I am worried that by washing it in hot water and a brush and antibacterial soap it will ruin it - any Jessica nail techs out there who can explain how to clean this type of foot file?