Marshmallow stains on outdoor sofa fabric can be a sticky challenge, but with the right approach, they can be removed effectively. Start by scraping off any excess marshmallow with a dull knife or spoon. Avoid rubbing, as this can push the stain deeper into the fabric.

Next, mix a solution of warm water and mild dish soap. Dip a clean cloth or sponge into the solution and gently blot the stain, working from the outside inward to prevent spreading. For tougher stains, a paste of baking soda and water can be applied, left for 10 minutes, then rinsed with cold water.

If the stain persists, consider using a fabric-safe stain remover or a mixture of white vinegar and water (1:1 ratio). Test any cleaner on an inconspicuous area first. Finally, rinse thoroughly and allow the fabric to air dry. Regular maintenance and prompt action are key to keeping your outdoor sofa looking fresh!