How can I remove food from under my Invisalign attachments?

It depends what you are currently doing to keep them clean, and where exactly the debris are.  You may consider an electric toothbrush (like an Oral B or Sonicare for example). If you have good access to these areas you may consider gently using a toothpick as well to remove any debris. If nothing works I would see your dentist to evaluate the issue.  Hope this helps!

If you have exhausted your options at home (brushing, flossing, waterpik), it's best to see your dentist or orthodontist asap.  Your doctor may need to remove the attachment to remove the debris, and then place a new one!