The large metal collecting plates could be washed in the dishwasher running a full cycle. After cleaning, ensure it's thoroughly dried before being put back into the machine. If the collecting plates are dirty, you could soak them in the water with detergent for 20-30 minutes before putting them in the dishwasher. You could turn on the air purifier, switch to the fan mode, then put the collecting plates on top of the air purifier overnight to be blown dry. This helps avoid any potential problems with damp collecting plates.  Please follow the cleaning tutorial video on this video: https://youtu.be/bXi3qHdLolY  for further guidance.  

Use the "Awesome" or another similar brand's spray cleaner mixed 50-50% solution with water (not the full concentrate) to pre-spray the collecting plates in a sink or tub. Spray both sides. Let sit for 1 minute. Then use a faucet hose to spray the collecting plate with hot water and rinse thoroughly until clean water runs down the drain.   Please follow the cleaning tutorial video on this video: https://youtu.be/bXi3qHdLolY  for further guidance. 

You may wipe it with a damp cloth or vacuum cleaner to evacuate the dust collected. Afterward, put the catalyst filter under direct sunlight to evaporate the accumulated moisture.

Please clean the collecting plates and make sure it's fully dried before putting them back into the unit.

As an electrostatic air purifier, Airdog air purifiers can make a static or crackling noise similar to an electric fly zapper if it senses a big particle (hair, piece of styrofoam, bugs) or a build-up of particles (dust, smoke, etc.) on the collecting plates, wireframe, or the grey colour liner inside. So, this noise typically indicates that deep cleaning is needed. Also, before you clean, you should run a quick and easy Diagnostic test to narrow down the area from which the noise is coming. You can turn it off, unplug it from the power source, and wait 10 minutes for the static inside to dissipate. Then, open the back cover, remove the collecting plate, close the rear cover panel, and turn it back on. Listen for the noise. Listen if the noise goes away when the collecting plate is not inside. If so, you know it is that filter that needs to be cleaned. If the noise continues, repeat the process but remove the wire frame this time, and run the unit without the wireframe or the plates inside. Suppose the noise continues when the wireframe and collecting plate are not in the machine. In that case, it likely means the main unit has a hardware or software issue that the Airdog Service Center needs to look at.