You can clean it with a cotton swab moistened with vinegar.
Fountain pen ink that has not been used for several days does not come out
Put a little warm water in a paper cup, dip the tip of a fountain pen, and remove the ink if it is smeared.
The fountain pens purchased from Daiso do not get clogged even if they are not used for a long time, so it would be nice to apply this technique to all fountain pens.
Making an anti-fog eyeglass cleaner
You can use a glasses cleaner soaked in dish soap and dried.
Surfactant, a dishwashing detergent ingredient, flattens the moisture (round shape by surface tension) caused by temperature difference, making the glasses transparent.