In Japan, most of the optical shop provide free spectacle cleaning service. It is so simple and is self-service. They will put a small device outside their shop. You just have to soak your spectacle into the water in the device. Then press a button to activate the device and it will do the cleaning. After 1 minute, the device will stop. You just take out your spectacle; soak it inside clean water and wipe using tissue paper. Here you go…. your sparkling clean spectacle.