I had it before on a VW bug I restored. I just use a small flat screwdriver to get under it and scrape it up. Some can be difficult to remove if it's still stuck but lots of times it just comes out easy as it's no longer attached. some areas you will need something with a bit of a hook to get under the edge of the gutter where the metal overlaps. I will try to post pictures in the next day or so.
