In such cases, soak overnight in water and a cap-full of bleach. On hot summer days, beer glasses made of clay can be chilled in the freezer. Be careful not to expose them to sudden changes in temperature. They may scratch table surfaces. After washing, turn upside down and let drain overnight.
Sake flasks with narrow mouths require a long, thin brush for washing the inside.
Sake will make the pink colors of Shino deepen. Green tea will add a wonderful gradation to the work. Because of the high iron content in the glaze, DO NOT microwave.