1. Before cleaning, use a clean soft paint brush (preferably a 1-inch wide brush) and dry compressed air with a pressure of about 0.1Mpa (1kg/square centimeter) to remove dust from the circuit board.
2. Cleaning can be done with a specialized cleaning solution for circuit boards (commonly known as board cleaning water), which can be purchased at specialized stores. If there is no washing water for the board, you can follow the following steps: (Nowadays, we usually don't use washing water anymore) First, rinse with tap water, paying attention to the soft water flow and not too strong. While rinsing, use a soft brush to carefully brush both sides of the circuit board.
3. Then use a soft brush dipped in neutral soap to carefully and gently clean every part of the circuit board, especially the jumper plug, the inside and bottom of the slots (CPU slot, AGP slot, PCI slot, memory slot), the bottom of the IC socket, the north and south bridge chips, BIOS chip and every other IC chip, and the bottom of the large capacitor. When operating, be careful not to touch or tilt small capacitors and other components installed upright; If the soap foam is found to be very dirty, it should be rinsed with clean water and then scrubbed with soap until the soap foam is white.
4. Then slowly rinse the circuit board thoroughly with clean water. Attention: The soapy water must be thoroughly washed clean.
5. After washing, use compressed air with a pressure of about 0.1Mpa (1kg/square centimeter) to blow away water droplets, especially the jumper plug, the inside and bottom of the slot (CPU slot, AGP slot, PCI slot, memory slot), the bottom of the IC socket, the north and south bridge chips, the BIOS chip and every other IC chip, the bottom of the large capacitor, etc., from different directions to blow away all water droplets in the gaps. If compressed air is not available, a rubber hand pump from a watch repair or camera repair professional can be used, but this can be tiring.
6. Wash the circuit board again with slightly distilled water or anhydrous alcohol (with the side where the components are soldered facing upwards, place the circuit board diagonally, and clean it from top to bottom with a clean oil painting pen of 10-12 grit dipped in anhydrous alcohol). Using carbon tetrachloride yields better results, but it is toxic and must be used with caution. Do not use unless absolutely necessary. It is generally recommended not to use carbon tetrachloride.
At this point, the cleaning is over. This way of cleaning is not only clean and thorough, but also cost-effective, environmentally friendly, and healthy.