If it is adhered on the same way as the emblems then I suggest leaving it in the sun or heat gun and then any type of string. I used some thick fishing lines for mine which was great because it didn't tear.
My car was a "spoiler delete" car, and I felt it needed the spoiler to capture the true M5 look. I got a spoiler from Adam (Clemster) and put it on using 3M Super Strength Molding Tape. I bought the tape online, but subsequently discovered it is sold at Walmart. Incidentally, this tape is useful for all kinds of things, automotive and otherwise.