I use the same process;
I use a heat gun. Just be careful of getting to close, you can damage the badge/paint. Fishing line works great, but with the heat gun, never really needed it.
WD40 works amazing on the goo left behind. Theres no chemicals to damage the finish and cleans easily with soap and water. Just saturate a spot on a rag, and spray the site, then rub and repeat.