Buttercream stains on an outdoor table can be stubborn, but with the right approach, they can be easily removed. Start by scraping off any excess buttercream with a dull knife or spatula. Mix a solution of warm water and mild dish soap, then gently scrub the stained area with a soft brush or sponge. For tougher stains, apply a paste of baking soda and water, let it sit for 10-15 minutes, then scrub and rinse. If the stain persists, use a mixture of white vinegar and water (1:1 ratio) and blot the area. Always rinse thoroughly with clean water afterward. To prevent future stains, consider using a tablecloth or sealant for your outdoor furniture. Regular cleaning will keep your table looking pristine.