Aggieman
I've considered something like Windex or Goo Gone, but am hesitant because I don't know how those will react with the paint.
Goo-Gone is my usual go-to for adhesive removal...but it'll take that NMF off like lacquer thinner would.
Windex might be a better bet...but I think I'd try a low-tack 'blotting' action with the same masking tape first. Done carefully, it might do the job.