How can I whiten my Invisalign attachments/buttons after they've been stained from Indian curry? Whitening strips do not work.

I just got invisalign a few days ago with attachments on my canines and molars. Lucky I do not have attachments on the four front teeth. I asked for the whitest compound my dentist had as my teeth are really white to begin with. I was doing really well with keeping me teeth white but I had Indian curry last night (without my invisalign) but my attachments stained yellow REALLY bad. I'm embarrassed to smile because its such a huge contrast to my other white teeth. What other foods should I avoid?