EverSmile AlignerFresh Original Clean Foam – Cleaner Compatible w/Invisalign and All Clear Aligners & Retainers – Eliminates Bacteria, Whitens Teeth, Fights Bad Breath – 25ml (1 Pack)

It looks mostly like the resign from the attachments is stained. Besides all the other advice, you could try this foam you put in your trays. I use it and I really like it. EverSmile AlignerFresh Original Clean Foam – Cleaner Compatible w/Invisalign and All Clear Aligners & Retainers – Eliminates Bacteria, Whitens Teeth, Fights Bad Breath https://a.co/d/08DH8Msw