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I run a graphic/web/sign writing business and I deal with this stuff on a day to day basis... there a few tips of the trade!
1. When removing the decal, heat it up first, to give you a better chance of the glue coming with the film.
2. If there is glue left on the surface, SOAK it in turps (paint condition dependent, if it is low quality paint and likely to damage, do not use turps) then use a plastic edged blade (kids knives work well if you dont have sign writers equipment) to scrape off as much as you can
3. there will be left over glue even after step 2. a generous spray with water and hand washing soap over the glue area, then scrub with a clean, but rough textured cloth. You do not want a fine weave or chamois, you want something that will grip the glue. The idea behind the soap and water is it will stop the glue from re-adhering and spreading.
4. Wipe clean with another cloth. there may be extra glue still, so a separate rough cloth with metho will help with this.
5. Polish or wax after this process. Turps, metho and the like are not great for paintwork that is not 100%. It tends to make the paint look very powdery and dry, so you need to replace the protective layers of wax/polish.
I hope this helps! Any questions, please feel free to message me.