Years ago, I lived in an apt.
A week before moving out, a friend spills their drink on the carpet.
I get some quality carpet cleaner to clean the stain, and the spot is now noticeably much cleaner than the rest of the carpet. Not bleached, actually clean looking.
The apt keeps my deposit and says we ruined the carpet and it needs to be replaced. Non negotiable.
Sounds like ADHD except 12, 13, 14. Those sound like something else.