The reason behind it being difficult is that the adhesive breaks down and the paint around it may bleach. This makes it quite difficult for you to get rid of it easily if you wait for a long time. There are a few steps which one must follow while they are planning to get rid of old stickers from their cars.

The first thing that you have to do is warm the sticker with the hairdryer and then blast the sticker with hot air for about a minute. So if your dryer is on low heat you can hold it close to the sticker and if you have set it too high then hold it further away from the sticker. The next step is to gently peel back a corner of the sticker using your fingernail or a rubber spatula and make sure that there is nothing metal. Peel one of the corners of the sticker and once you have a good grip continue peeling the sticker back, do it until it comes off. If more heat is required then continue to apply heat. The last step is for you to remove the leftover adhesive and for this, you can use rubbing alcohol, Goo Gone or an adhesive remover design for cars. Hence, rub gently with a cloth until the surface underneath is clean and smooth.

Now, if you don't have a hairdryer or heat alone is not working for peeling off the stickers, then you can use various kinds of solvents that are available in the market. They try to loosen the adhesive and soak the sticker off your car. Therefore, first, you need boiling water. You can soak a cloth in boiling water and carefully apply it to the sticker or pour the water directly over the sticker. This can be used as the first solvent. The second option is white vinegar; use the same technique as with boiling water. You can use Vodka as well; you just need to put the substance directly on the sticker. Lastly, you can even opt for rubbing alcohol. It is also very famous for removing stickers from cars easily.