Here is an amazing recipe to make the best window at home for removing car window stickers:
Take one-fourth bowl of apple cider vinegar, two bowls of water, 1 tbs of starch, 10 to 12 drops of oil, and one-fourth of alcohol. Then mix it and now fill a spray bottle with this mixture. Spray it on the windows and give it some time to wait for the adhesive to get loose. It's time to peel off the decal from the windows smoothly.