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

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

2. Prepare a Cleaning Solution:

- For organic stains (mildew, algae), mix equal parts water and white vinegar.

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

- For deep-set grime, a mild dish soap solution works well.

3. Scrub Gently: Use a soft-bristle brush or sponge to avoid scratching the wood. Apply the solution and scrub in circular motions.

4. Rinse Thoroughly: Hose down the table or wipe it with a damp cloth to remove residue.

5. Dry Completely: Let the table air-dry or use a clean towel to prevent moisture damage.

For persistent stains, sanding the affected area lightly and reapplying a wood sealant may be necessary. Regular maintenance, like covering the table when not in use, can prevent future staining.

By following these steps, your outdoor table will look as good as new!