In an active household with children, pets or an avid gardener, grass stains can easily be tracked onto vinyl floors. Try to catch these stains early to save extra effort later on and prevent permanent discoloration. Lemon juice is a simple solution that will help remove even set-in grass stains. Remove excess soil and grass stains using a moistened sponge. Cut a lemon in half crosswise. Apply directly to the stain, rubbing gently to remove the stain. When using citrus-based solutions, remember that they can damage rubber and some other plastics. Rinse the area with a clean sponge dampened with water. Pat dry with a clean paper towel, or rub with a dry soft towel. Don't rub with the paper towel as it is abrasive and may scratch or otherwise damage vinyl floors.
Caution: Do not use ammonia on vinyl floors as it is corrosive to vinyl. Never mix cleaning agents or chemicals, the result can be dangerous or deadly. Before cleaning, always test the agent on an inconspicuous location to determine its suitability and to make certain it does not damage the material. Wear appropriate clothing such as gloves and protective eyewear, and work in a well-ventilated area. Accidental inhalation or ingestion of cleaning agents can be hazardous and even fatal, particularly to pets and children.