Using these Celtic Hoop Decals is a breeze. First, clean the surface where you want to apply the decal to ensure it's free of dust and dirt. Then, carefully peel the decal from the backing paper and position it on the desired spot. Smooth it out gently with a credit card or a similar flat object to remove any air bubbles. When it comes to maintenance, just use a mild soap and water solution to clean the decal periodically. Avoid using abrasive cleaners or sharp objects that could scratch the decal. Also, be careful when applying the decal in extreme temperatures, as it may affect the adhesion. With proper care, these decals will last a long time and keep your vehicle or wall looking great.