If you wear the mask for a long time, you will be worried about dirt not only on the outside but also on the inside. If you leave sweat, sebum, and foundation on it, germs can grow.
However, I hesitate to make the mask disposable in a short time. When I was wondering what happened, I found a product called "Non-woven fabric sheet for masks" at the 100-yen shop CAN DO, so I bought it.
Non-woven sheet for mask
As the name suggests, "nonwoven fabric sheet for masks" is a non-woven fabric sheet (polypropylene) made for masks. Place it inside the mask and use it by sandwiching it between the mask and your face. This prevents sweat and foundation from sticking directly to the mask. If it gets dirty, you can just throw away this non-woven mask sheet and continue to use the mask while keeping it clean to some extent.
I was worried that I couldn't fix it by sticking it on the mask, but it fits naturally. Since it is a very thin sheet, it will not stand out even if it slightly protrudes from the mask. It seems that sweat will stick to your skin during the hot summer months, but I think it is easy to use during the chilly autumn and winter seasons.
"Non-woven fabric sheet for mask" is a bag of 15 sheets and the price (excluding tax) is 100 yen. If you are concerned about the dirt inside the mask, why not use it? As an aside, the recent 100-yen shops are full of mask-related goods. Please also check the " Mask Inner Cover " and " Temporary Mask Case" introduced earlier.