Rather than use specialist cleaning pellets such as Urnex Grindz, many people recommend using rice. Indeed, rice works for some machines. However, we advise against this cleaning method. The primary reason for this is that it will invalidate most manufacturer warranties if your grinder sustains damage due to cleaning with rice. One example is Baratza, who have stated that they will not be liable for breakages caused by using rice and instead recommend using specialist pellets such as Grindz or Full Circle. Using rice to clean your grinder can place the motor under more stress than it can cope with, as dried rice is significantly harder than the average coffee beans.