To use this 'Calls of Cthulhu' wall tapestry, you can hang it on the wall of your room or outdoors to add a unique touch. When washing, just put it in the washing machine with cold water, set it to a gentle cycle and use mild detergent. After that, tumble dry it on low heat. Avoid using bleach or harsh chemicals as they may damage the colors and fabric. Also, don't wring the tapestry to prevent it from losing its shape.