To use your Rocketman Zemo Fever sweatshirt, simply put it on and enjoy its comfort. When it's time to clean, machine wash it cold and inside out with similar colors. Only use non - chlorine bleach if needed. After washing, you can either hang it to dry for the best results or tumble dry it on a cool or low - heat setting. Remember, using fabric softener might make the colors fade, so it's best to avoid it. Also, don't iron or dry clean the sweatshirt to keep it in good condition.