This works...

Wait for a hot sunny day
Park car in sun for a couple of hours
Block up hood with small blocks in the front corners
Place a clean towel on the affected area
Place a big block cylinder head on the towel and go away for the rest of the day.
Put car back in garage and leave cyl head on hood till the next day or so.

Repeat if necessary, the bow will disappear..,and never return

Propane torch???? Are you kidding me??? As always be careful with some of the advice given here