Mullion stains on outdoor tables can be stubborn, but with the right approach, you can restore your table's appearance. Here’s a step-by-step guide to effectively remove these stains:

1. Identify the Stain Type: Determine if the stain is from dirt, mold, or rust, as each requires a different cleaning method.

2. Prepare a Cleaning Solution:

- For general dirt or mold, mix warm water with mild dish soap or white vinegar.

- For rust stains, use a paste of baking soda and water or a commercial rust remover.

3. Scrub Gently: Use a soft-bristle brush or sponge to scrub the stained area. Avoid harsh abrasives that could damage the mullion.

4. Rinse Thoroughly: After scrubbing, rinse the table with clean water to remove any residue.

5. Dry Completely: Wipe the table dry with a clean cloth to prevent new stains from forming.

For persistent stains, repeat the process or consider using a specialized outdoor furniture cleaner. Regular maintenance, like covering the table when not in use, can also prevent future staining.

By following these steps, your outdoor table will look clean and well-maintained for years to come.