•Run your mortar and pestle under warm water to remove any dust and dirt.
•Add a small handful of white rice to your mortar, about three tablespoons. Mix in one tablespoon of water and start grinding the rice. White rice works best since it’s easiest to spot the grit falling off the mortar and into the rice. and use circular motions to grind the mixture until the rice is a powdery consistency.
•Rinse and repeat. Continue the process of soaking the mortar in water and then grinding white rice until the rice mixture no longer collects dirt. It might take multiple repetitions of rinsing and grinding before the crushed rice remains white.
•Air-dry the mortar and pestle. Set it aside before using it for cooking.