To use your 'Eternal Rivals' wall tapestry, you can hang it indoors on your wall to add a decorative touch to your room, or outdoors in a covered area. When it gets dirty, simply toss it in the washing machine. Use cold water and select the gentle cycle, then add some mild detergent. After washing, put it in the dryer on low heat. Avoid using hot water or harsh detergents as they may damage the colors and fabric. Also, don't hang it in direct sunlight for long periods to prevent fading.