[header] How to cook brown rice in a rice cooker [title] Rinse the rice under cool water. [step] Place the brown rice in a fine mesh strainer and quickly rinse it under cold running water for about 30 seconds. [substeps] Make sure that the strainer is made from very fine mesh. 
If the gaps between the wires are too large, you could end up losing an unfortunate amount of rice as you rinse it. Note that you may not always need to rinse the rice, and this is somewhat of an outdated practice.