The material of the toilet seat is high-quality plastic with a hygienically sealed surface. For this reason, cleaning with water and mild soap is sufficient. This surface is destroyed not only by the direct use of an aggressive cleaner but also by vapors from the action of a cleaning agent in the toilet bowl with the toilet seat closed at the same time. Using aroma stones on the rim of the bowl or tabs from cisterns with a deposit shaft can also destroy the surface of the toilet seat. The hygienically closed protective layer is damaged by the effects of vapors, which causes microscopic pores on the surface to open up. Due to the capillary action, the urine-water mixture can thus penetrate the surface and the toilet seat will discolor. When using a toilet cleaner to clean the toilet, make sure that the toilet seat set (seat ring and lid) remains open until the cleaning agent is completely flushed out of the toilet bowl. This will prevent vapors from the cleaner from attacking the surface of the toilet seat and hinges.