Disconnect power and unplug. Place the air purifier on a clean, flat surface. Locate the screws located at the bottom of the air purifier. Use a screwdriver to remove the screws. Separate the top half of the air purifier from the bottom half. Remove the filter. Clean the filter with water or a vacuum cleaner. Place the filter back into the air purifier. Reconnect the top half of the air purifier to the bottom half. Tighten the screws. Put the air purifier back in place and plug it in.