We all know that more dirt accumulates, and we must spend more time dealing with it. The owner of this case has formed a habit of cleaning any dirt immediately, but the diffusion velocity of water stains is beyond belief. "How late is too late?" the owner said. There are clouds of water stains on the shower glass and floor-to-ceiling windows in the home, which can no longer be solved by the regular cleaning method. Instead, those cleaners and brushes on the side describe how hard he worked...