Plastic rear window

[alan b fisher <hello39@idt.net>]

Recently picked up a '72 Midget that the previous owner placed a
"For Sale" sign on the middle of the clear plastic rear window in the
top!
He used what appears to be scotch tape and it has been there for about
a year or so. I am looking for any suggestions on products that may
do a decent job removing the tape without leaving any telltale scars.
Maybe some has been there,done that!
Thanks,
Alan