Using these Celtic Crest Decals is easy. First, clean the surface where you want to apply the decal to make sure it's free of dirt and dust. Then, carefully peel the decal from the backing paper and stick it gently onto the surface. Smooth out any air bubbles with a soft cloth. Remember to choose a dry and warm day for application for the best results. When it comes to maintenance, you can clean the decal with a mild soap and water solution. Avoid using abrasive cleaners or sharp objects that could scratch the decal. If you need to remove the decal, slowly peel it off starting from one corner. If there's any residue left, you can use a little rubbing alcohol to clean it up.