Because I am very busy at Hello Clock Studio, I will send it from Ginza Public Information Advertisement. Today too, I hope you see what it is ... If you put a watch on the main subject ... you will get black like this Clock Studio 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 it solidifies. Then you can not clean up every corner with brushes and running water. It is not necessary to disassemble and clean up because it is not broken, but it is surprising that there are many people who think that it would be beautiful anyway. The dirty of summer is persistent, and it goes into the gap between the breath and the back cover. Such a dirty disassemble the exterior once and it will be beautiful if it is applied to an ultrasonic washer. For example ... A watch that is so dirty ... Ultrasonic cleaning will make it very beautiful like this way. By ultrasonic vibration, micro bubbles are generated in the water, and the shock waves that emerge at the moment when the bubbles start will crush the fine gaps. Because the mechanical wristwatch is very delicate, we recommend this ultrasonic cleaning. Also, it is good not only to wash, but also to perform regular maintenance.