I found expensive Himalayan rock salt at the 100-yen shop "Daiso" the other day! Introducing the idea of "natural insect repellent" that makes use of the cool pink color.
"Mentha oil" extracted from mentha grass is used. Products from Kenei Pharmaceutical and Kitami Hacka Trading are easily available and can be purchased at pharmacies and cosmetics departments for around 1,000 yen for 20 ml. According to the official website of Kenei Pharmaceutical, the scent of peppermint oil gives a refreshing sensation to humans, but it is a scent that is very irritating and unpleasant for many pests.
To make it, just put about 2 tablespoons of rock salt in your favorite bowl and add a few drops of peppermint oil. Place this in the entrance, near the window, or in the path of pests such as the kitchen. If you don't have rock salt, you can soak it in tissue, gauze, or cotton. The scent has an insect repellent effect, so add oil when it weakens.
It is better to use glass or pottery for the container to avoid deterioration due to mint oil. If you like the refreshing scent, we recommend you to enjoy it as an aroma in the bathroom. Mentha oil has been introduced in various ways in the past, so please try it at this time of year!