Just make sure you pull it off together, theres actually two layers to tint and if you don't pull them off together then you might as well just sit there for hours scraping it off. So if it starts to come apart add more ammonia and heat, be very liberal with the ammonia and keep adding it when it dries up. A small area like a headlight shouldn't be hard to remove, another option some people like is to use a steamer like for clothing of you or someone you know happens to own one. Tint is a pain in the @ss!!!!