If you've landed in Narita Airport and have to use the restroom, you'll realise that there are two rolls of toilet paper in each cubicle: one that looks like your usual toilet paper, another that is smaller than the average toilet roll. 

The smaller roll is toilet paper meant for your smartphones, because even smartphones need a good cleaning after a visit to the restroom. 

Smartphones are hotbeds for bacteria as well, especially after you've brought them into the cubicle with you. They're even said to be five times dirtier than a toilet seat. 

So pick up the small toilet roll and clean your smartphones before you go. The smartphone toilet roll even has wi-fi information and travel tips for foreign tourists.

Stay clean and enjoy your holiday in Japan! 

Cover image from Mental Floss

*Article source: The Malay Mail Online