To use your Summoning Cthulhu sweatshirt, just put it on like any regular crewneck sweatshirt. It's great for casual outings or staying cozy at home. When it comes to washing, make sure to turn it inside out and wash it in cold water with clothes of similar colors. Only use non - chlorine bleach if there are stubborn stains. After washing, you can hang it to dry for the best result. If you're in a hurry, you can use the cool or low - heat setting on your dryer. Remember, fabric softener can make the colors fade, so skip it. Also, don't iron or dry clean this sweatshirt to keep it in good shape.