Another small electronic appliance which you can not hardly see in Europe.
Ultrasonic cleaner is an ideal appliance for cleaning eyeglasses, accessories or wrist bands of watches. You just need to fill in a tap water and push the button and wait for 2-5 minutes.
Some people have at home but you mostly can see and use it at eyeglass stores. Ultrasonic cleaner is usually located outside of the store, at the entrance. You can put your eyeglass into the ultrasonic cleaner and push the button. In a few minutes, your eyeglass will be clean. Especially the dirt which is located between the lenses and the frames will be removed. The significant result is the nose pads.
Unfortunately, ultrasonic cleaner is not intended to use abroad therefore you can not bring home but better to check the nearest eyeglass stores upon arrival in Japan and before your departure.