Buckwheat milk stains on an outdoor table can be stubborn, but with the right approach, they can be easily removed. Here are some effective methods to tackle the problem:

1. Immediate Action: Blot the stain with a clean cloth or paper towel as soon as possible to absorb excess liquid. Avoid rubbing, as it may spread the stain.

2. Dish Soap Solution: Mix warm water with a few drops of mild dish soap. Dip a soft sponge or cloth into the solution and gently scrub the stain. Rinse with clean water and dry the surface.

3. Vinegar and Baking Soda: For tougher stains, create a paste with baking soda and water. Apply it to the stain, let it sit for 10-15 minutes, then scrub gently. Wipe with a cloth dampened with white vinegar to neutralize the baking soda, then rinse.

4. Hydrogen Peroxide (for light-colored tables): Test on a small area first. Apply a small amount of hydrogen peroxide to the stain, let it sit for a few minutes, then wipe clean.

5. Prevent Future Stains: Apply a protective sealant or wax to your outdoor table to make it easier to clean spills in the future.

For persistent stains, repeat the process or consider using a commercial outdoor cleaner designed for your table’s material. Always test any solution on an inconspicuous area first to avoid damage.