Before installing a wall wallpaper, you need to read the basic installation rule of the materials, it’s important to know the recommendation of installation process. Proper wallpaper preparation is essential. Generally walls must be smooth, clean and dry. Wall coverings will not adhere well to dirt, soap or grease. Clean the walls with household detergent or with a solution of six parts water to one part ammonia and rinse with clean water. Use of a non-staining clear wallpaper adhesive, avoid getting any adhesive on the front surface of product to prevent staining.