Not sure what type you have there, but there are 2 nasty "hitch hikers" here that are smaller and a pain in the arse to remove. What worked the quickest for me was to use a knife and scrape them off. However, if you cut them off, pieces of them will still be lodged within the material.
I like that credit card idea. Is it better to use Visa or Mastercard? LOL!
iSnipe