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1. Preparation Before Cleaning
Turn off the air conditioner and ensure it is completely disconnected from the power supply. This is the foundation of safe operation and prevents accidents during the cleaning process. Gather the necessary tools, such as a soft-bristled brush, a cloth, clean water, and a neutral cleaner. Avoid using strongly acidic or alkaline cleaning products to prevent damage to the air conditioner components.

2. Cleaning the Filter Screen
Open the AC panel and gently remove the filter screen. If there is a heavy buildup of dust, you can first use a soft brush to lightly sweep away the surface dust. Then, rinse the filter screen under running water. For stubborn stains, you can add a small amount of neutral cleaner to the water to assist with the cleaning. After washing, place it in a cool, ventilated area to air dry naturally. Avoid direct sunlight or using a hairdryer on a hot setting, as this may cause the filter screen to warp.

3. Cleaning the Cooling Fins (Heat Sinks)
The cooling fins are located behind the filter screen; their delicate structure makes them prone to accumulating fine dust. You can use a soft-bristled brush to gently brush along the grain of the fins to remove surface dust. For stubborn dirt, you can lightly spray a small amount of water and wipe them down. Be gentle to avoid applying excessive force, which could deform the cooling fins.

4. Wiping the Casing and Air Vents
Use a damp cloth to wipe the outer casing and the air vent grilles. For stubborn stains, you can dip your cloth in a diluted neutral cleaner solution to wipe them, and then wipe again with a cloth dampened with clean water. Be careful to prevent moisture from seeping into the internal electrical components of the air conditioner.

5. Reassembly and Inspection After Cleaning
Once all parts are completely dry, reinstall the filter screen in the reverse order of removal and close the panel. Turn on the power and run the unit for a short period to observe if it is operating normally and listen for any unusual noises.

6. Recommendations for Cleaning Frequency
Given the climate conditions in Fuzhou, it is recommended to clean the air conditioner once before the high-usage seasons. Additionally, if the air conditioner has been unused for a long period, it should be cleaned before being put back into service.

7. Limitations of DIY Cleaning
Cleaning the outdoor unit is generally not recommended for DIY attempts due to its specific installation location and the risks associated with working at heights. Similarly, if the air conditioner shows abnormalities, such as a noticeable decline in cooling performance or increased operating noise, it may require inspection and maintenance by a professional.

8. Storage of Cleaning Supplies
After cleaning, clean the tools used and store them properly for future use. Neutral cleaners should be kept in a cool, dry place out of the reach of children.

9. Summary of Precautions
Always ensure the power is turned off before performing any operations. During the cleaning process, prevent water from entering electrical components such as the motor. Do not reinstall or use the filter screen until it is completely dry. Avoid using highly corrosive chemical agents. DIY cleaning is strictly limited to the accessible parts of the indoor unit; for complex issues, professional services should be sought.