Fingerprints and other stains that tend to stick to smartphone screens. You may wipe it with the cloth of your trousers, but if possible, you should use a special tool to clean it. Introducing useful and cute goods found in the 100-yen shop CAN DO.
A product called "Cleaner Card Cat Pattern" with an illustration of a cute cat. One side is microfiber, and you can clean the dirt by rubbing the screen of your smartphone. It has a moderate hardness, so it is a good impression that you can wipe it while firmly adhering to the screen. You can easily use it at any time by putting it in your smartphone cover or wallet pocket.
Please note that even if the card becomes dirty, it cannot be washed with water. After using it to some extent, you need to dispose of it. If you buy several at a time, you can exchange them immediately when you need them, which is convenient. If you see it at a 100-yen shop, why not pick it up? The approximate size is 53 x 84 mm. The price is 108 yen (tax included) per piece.