Do I have to take off my clothes when I enter my own balcony?

You should take off your clothes when you enter the bathroom. Whether it's a desktop sauna, a Japanese bathhouse or a general bathhouse, you will be given a wardrobe key as soon as you enter, so that you can take off all your clothes and lock them inside. If you have valuables, you can put them on the counter. After that, you can take a clean towel in the shower or bathhouse and cover it where you want, and then you can usually do other expenses such as brushing your back after washing.