Remove any grease stains on the wallpaper by scraping away the excess grease with a blunt knife. Begin at the edges and work your way in so the stain doesn’t spread. Pat some potato flour or baby powder on the stain to help absorb the grease. Brush away the powder remains with a soft brush. If the grease stain remains, place a clean tissue paper on the stain and iron it on low heat.
Allow wet stains, for example mud, to dry thoroughly before brushing them with a soft brush. Many light stains can be removed with old white bread. Gently rub a piece of moist bread on the stain until it fades.