Water stains on paper wallpaper can look bad and be hard to remove. Cleaning the stains is a delicate process, and you don't want to use too much water or you could create even more stains. Make sure to test the solution on a small part of the stain before you try to clean a larger area to make sure it doesn't create more stains or ruin the look of the wallpaper.
Make a bleach solution in a bucket with 30 per cent bleach and warm water. This will neutralise the stain.
Rub at the stain by dipping a sponge into the bleach and warm water solution.
Allow it to dry. If the stain persists, it may have to be painted over.
Dust vinyl and acrylic with an electrostatic duster before cleaning it. Start at the bottom and work your way down.
Make a solution of mild dish soap and warm water.
Spot clean the wallpaper using the solution and a soft sponge.
Wipe dry with a lint-free cloth.