After using the washbasin for a long time, oil stains and dirt are easy to accumulate. At this time, you can use oxalic acid to scrub the surface of the washbasin, and then rinse it with water after a minute, and the washbasin will become bright.
这是因为草酸的酸性极强，对于去除油污等颇有效果，但切记使用草酸后要尽快用清水清洗，以免物体表面被酸性物质侵蚀。
如果还是无法改善，可以购买瓶装安全漂白剂，倒入洗脸盆的污渍处，浸泡20分钟左右，用毛巾或海绵擦洗，再用清水洗净。
But don’t rub the surface with scouring pad or sand powder, because this will grind the surface of the basin and make it tarnished.
The above methods of washing basins can also be applied to other ceramic sanitary ware. In addition, in order to protect ceramic sanitary ware, the following points should be paid attention to:
1. Do not flush information paper, diaper pads, sanitary napkins and other items that are easily blocked into the toilet;
2. To prevent breakage and water leakage, do not hit the ceramics;
3. When it is blocked, please use a skin suction device to remove it immediately;
4. Do not use and store in an environment with water below 0°C;
5. In order to prevent the bottom of the toilet from bursting due to the expansion of cement, glass glue must be used for installation;
