Use Kleen-Strip's Aircraft Decal & Adheasive Remover. Part # EAD-908. It's great stuff! It also is the most fantastic pine sap remover I have ever found! Grab the better part of the sap drip with a paper towel and spray a shot of the remover on another paper towel and wipe the sap off
If you have painted pin stripes you want to remove spray them with Easy-Off oven cleaner. You'll have to work it in with several aplications but it does work.