Remove all 4 nuts.
Saw thru 3M tape with braided fishing line.
Use two people to pull the spoiler off evenly
or you could dent the trunk lid by trying to
pull one side off at a time by yourself. Take
your time as you only have one shot at it.
GooGone works wonders removing any residual
3M tape. Let it soak into the 3M tape before
attempting to remove the residue. Roll the
offending 3M tape off with your thumb.

 

Goo Gone will get rid of the adhesive....but it will not be fun...!