Hi any idea how do i get rid of this stain Thank you

This looks like mold. There isn't a way to remove mold. I have tried many method too. The only way is to dispose the clothes already.

Agree with mummy jorelle. However, I did try with using vinegar and bicarbonate. Managed to lighten it a little.

best to throw it away. or try washing it in the washing machine at 60 degrees.

Better to dispose if can. Mould can spread. :(

I soak it in alcohol before washing!

Did you try colour bleach?