How can I get rid of this weird again (pic included)

[TheBrilloPad]

So usually everything comes out in the wash, and for white things I use Napisan and leave it out in the sun. But this is coloured so I don't know if it would work?

I have washed it a few times and NADA (so it's not a fresh stain now). My son bloody loves these leggings (so do I), and I'm loathe to chuck them out. I have no idea what the stain even is. Looks like a mould pattern but no clue how it got there.

Anyone got an genius suggestions?

Sorry I can’t offer any advice but I couldn’t work out why you had put a carrot 🥕 in the middle of the picture 😀. Eyesight not very good. I can see where I went wrong now!

I had mould on my sons new hoody recently.
Wet on the first day of a 5 day School trip and left in a bag for the remainder! I had already washed it before I realised.

I was prepared to chuck it if all went wrong but tried the mould and mildew spray then hung it on the line all day, washed again and it mostly came out!

Failing that if you both love them they can be used as pj's

Vanish or Ariel stain remover. Not the Whites one.