Is there a way to remove Invisalign attachment residue that has become discolored?

I had Invisalign a few years ago, and my dentist used attachments buttons. They have since been removed, but I knew there was some residue. Now, that residue is starting to discolor. It is obvious that it is on the residue because the surface of my teeth feel different there. I am really starting to get embarrassed and frustrated by this. Are veneers my only option?