2. Brush it carefully from the tower wall to the bottom with a broom first. When you brush, the water will become turbid. You need to set an order, from left to right and from top to bottom, and try not to miss anything.
3. When you feel that the washing is almost done, you can drain the water. The outlet valve is under the water tower. Generally, just turn the switch. I think it's rusty. Just remove the outlet valve as a whole, then wrap it with a white belt and reinstall it. Stir the water when you put it, and take away the dirty things. A tower of water is also quite stressful.
4. Then you have to wipe it with a towel. From top to bottom, along the bulge on the inner wall of the water tower, wipe it round and round, and wrap the towel behind the broom where it can't be wiped. The friction of the towel is still quite large, so it will be fixed by making a summary. Basically, towels need to be washed once, so you can't prepare too little water at first.
5. Rinse with clean water after wiping, and install a water outlet valve at the bottom.
There is basically no corresponding sanitation and management mechanism for secondary water storage in China. All maintenance and hygiene depend on individual users. For your own health, the water tower must be cleaned regularly, basically once every six months or once a year.