When cleaning the manhole, it is very important to choose the right detergent. Here are some suggestions for detergents suitable for cleaning human holes: 

 I. Special cleaning agent 

 For the cleaning of industrial equipment such as manholes, you can choose to use special industrial cleaners. These cleaners usually have strong decontamination ability and good corrosion control, which can efficiently remove dirt and grease on the surface of the equipment without causing damage to the equipment itself. When choosing, you should pay attention to choosing a cleaner that meets the material and cleaning requirements of the equipment. 

 II. Mild detergent 

 If there are no obvious stubborn stains on the surface of the manhole, you can choose to use a mild detergent to clean it. This kind of cleaner usually does not corrode or damage the surface of the equipment, and has a good decontamination effect. For example, some neutral cleaners or weakly acidic/weakly alkaline cleaners can be considered. 

 III. Avoid using detergents 

 1. Strong corrosive cleaners: Avoid using strong corrosive cleaners, such as strong acid or strong alkali solutions, because they may cause serious corrosion and damage to the surface of the equipment. 

 2. Flammable and explosive cleaners: Avoid using flammable and explosive cleaners to ensure safety during the cleaning process. 

 3. Unverified cleaners: Do not use unverified or of unknown detergents, so as not to cause unpredictable damage to the equipment. 

 IV. Selection principle of detergent 

 1. Targeting: Choose the appropriate cleaner according to the type of dirt and material characteristics on the surface of the manhole. 

 2. Safety: Ensure that the selected cleaner will not cause harm to the human body and the environment during use. 

 3. Economy: Under the premise of satisfying the cleaning effect, choose a cleaner with high cost-effectiveness. 

 V. Precautions for cleaning 

 1. Pretreatment: Before cleaning, the surface of the manhole should be pretreated, such as removing loose dirt and grease on the surface. 

 2. Cleaning method: According to the description of the detergent and the material characteristics of the equipment, choose the appropriate cleaning method, such as wiping, rinsing or soaking. 

 3. Protective measures: During the cleaning process, necessary protective measures should be taken, such as wearing protective glasses, gloves, etc., to prevent the detergent from causing harm to the human body. 

 4. Follow-up treatment: After the cleaning is completed, the manhole should be thoroughly rinsed and dried to ensure the cleanliness and dryness of the surface of the equipment. 

 In summary, when cleaning the manhole, the appropriate cleaner should be selected according to the material, dirt type and cleaning requirements of the equipment, and the correct cleaning method and precautions should be followed to ensure the cleaning effect and the safety of the equipment.