I'm sure this has been posted before, try using the search.
First use a creditcard perfably one you are not going to use again, or very rarely.
Scrape the paste off using this fristly, and then for the rest there are numerious ways to remove the paste you can use a cleaner which is designed for removing paste which can be found at most online retailers.
For household, I used some nailvarnish remover, you can use this only if it doesn't include any added substances, like colouring.
You can also use 79-99% alcohol.