I've just noticed a smudge of paste on the front of the wallpaper that was put up about four weeks ago.\n\n It's only noticeable when the light is in the right place. It's a shiny streak. \n\nThe wall paper is matte and almost black so the shine is quite obvious. \n\nIs there anything I can do about it? I'm a bit reluctant to go at the paper with any kind of water or detergent obviously. \n\nIs it possible to get a decorator to just cover that one bit or will it be really obvious that the one little patch has been covered? \n\nThank you for your time.