I've had great success using Goo Gone. In fact, I've used it on probably 8-10 of my personal vehicles and a couple family members' vehicles with no issues. It is readily available at Walmart and most parts stores. I have a 16oz bottle with a spritzer nozzle and I think I paid around $5 for it a few years ago. It is still 3/4 full, which is enough to remove the badges of another 100 vehicles.