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Most business hotels have laundry rooms with laundrettes, so you can do your laundry there.
In Japanese English, laundrette is called "coin laundry".
You can also find many laundrettes in your neighborhood by searching "coin laundry" on Google Maps.
Some laundrettes accept Suica, but in most cases, you need to use 100 yen coins.
There is a machine in the laundrette that converts 1,000 yen into 100 yen coins.