Because I am busy with Hello Clock Studio, I will send it from Ginza Public Information Advertisement. Today, if you can see what it is ... then wearing a watch on the main subject ... you will get black like this Clock workshop The cause is dirt accumulated between the frame and the frame of the breath. Especially in the summer, I sweat often, so accumulated dust absorbs sweat and solidifies. Then you can not clean up every corner with brushes and running water. Since it is not broken down, it is not necessary until disassembly and cleaning, but it is surprising that there are many people who think that it would be beautiful anyway. Summer dildo is persistent, it will penetrate into the gap between the breath and the back cover. Once you disassemble the exterior, it will be clean if you apply it to an ultrasonic washer. For example ... Watch that is so dirty ... Ultrasonic cleaning will make it look pretty like this way. Vibration of ultrasonic waves generates micro bubbles in the water and crushes fine gaps in the shock wave that comes out the moment the bubbles start to fly. Because the mechanical wristwatch is very delicate, we recommend this ultrasonic cleaning. Also, it is good to perform regular maintenance as well as cleaning.