if you don't have access to a heat gun, try a blow dryer and some dental floss or fishing line. Dunno if they sell goo gone down here, but if you don't want to use the pitch oil/ gas on your vehicle, it's a great product. If you have access to a degreaser like simple green, you could try that too.
I should also mention that if using the heat gun to not hold it one place for too long. It can damage your paint. Move it around rapidly over the spot, hold like 6" away and use your hand to gauge the heat.
In many instances,I put the vehicle in the sun and when the vehicle body got hot and the double sided tape adhesive got tacky just rolled it off like chewing gum. Any stubborn stuff was removed using some cheap prestone polish as a cleaner.