| abstract |
(57) [Summary] [PROBLEMS] To provide a plumbing product capable of reliably preventing the generation of dirt. SOLUTION: An antifouling area 26 made of a water repellent is provided on a cleaning surface 23. By arranging the non-fouling area 27 in a horseshoe-like manner, The state of diffusion of the washing water 29 flowing down the washing surface 23 is improved. In addition, the entire surface of the cleaning surface 23 except for the vicinity of the water storage surface 31 is subjected to antifouling treatment using a substance having a contact angle with water of less than 90 degrees, and the cleaning surface near the water storage surface of the trap water is provided with water. An antifouling treatment is carried out using a substance having a contact angle of 90 degrees or more with respect to, thereby preventing the generation of silicate scale. |