Is that what you think was on it? or what I should use? Thinking about it, it did look like a type of thin tape but seeing as the car is 7 years old (today in fact) I guess it would have set rock hard by now.
Cheers,
Pete
Either or... i cant think of any semi-permanent bonds other than tape so would have imagined this is what they have used... and you can safely use it again in.
If you need to get it off, you'll need to get some bug and tar remover or similar and scrape it off with your nail... or just tape straight over it.