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Remove sebum stains from around the neck of a white T-shirt!

From now on, I would like to tell you how to remove the most troublesome sebum stains around the neck of a white T-shirt.
I was able to get the white T-shirt that I posted on the e-commerce site and crowdfunding site, but the Uniqlo white T-shirt I bought last year didn't come off easily, so I would like to share this information with you.
I'm wearing a white T-shirt, but I knew I'd be sweating for half a day outdoors, so I'm not sure if the reason why it didn't come off well was because I applied plenty of sunscreen to my neck as well. .

On other white T-shirts, it came off perfectly after just 2-3 applications (I didn't rub it at all), so I feel like the sunscreen is washing off with sweat and I can't get it off properly.
Also, even though Uniqlo's products are labeled as 100% cotton, they feel different to the touch, and I'm not sure if the sewing method is different. .
procedure
①Do the same thing before and after washing, but turn it inside out and apply the undiluted solution directly to the neck area with a toothbrush etc. (Please wear glasses for safety)
・Just apply it without rubbing and it will break down and come off easily and will not damage the fabric.
② If there is sebum stains on the applied area, it will turn yellow.
・I was really sweaty on a hot day last week, so I applied it the next day. .

③ When the yellow color disappears, apply the undiluted solution again and repeat until the yellow color disappears.
・The time it takes for the yellow color to disappear may vary depending on the gender (this time it took about 10 minutes to 1 hour)
・Hang it on a hanger and leave it there.
④Apply the undiluted solution and if it does not turn yellow, wash it (this is an indication that the dirt has come off)
This is a photo after washing.
I applied it 5 times to the back side, and although you can't see it in the photo, there was a slight stain left in some areas.
The front side is pure white (no photo)
The back side is falling.
Uniqlo's 100% cotton white T-shirt.
After two coats, it came off beautifully on both the front and back.

result
・I felt that women had less sebum stains (blackheads) and it was easier to remove (it came off after 2-3 applications)
・I don't know if it's due to age, but is it harder for men (me...) to lose weight? I felt like it too.
However, other than the first place, I lost in 2 to 4 tries, so I would like to think that age doesn't matter lol.

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