Mahogany's rich, dark colour adds a classic touch to your table. When you protect your mahogany surface with a thick pad or tablecloth, you're able to prevent most stains from occurring. But if a water stain occurs, leaving that telltale white ring or spot, it can detract from the appearance of your table. Because water stains are in the wood, not on the surface, they appear to be permanent. The key to removing the stain is to draw it out of the wood to remove the white mark.
Cover the water stain with a clean cotton cloth. Heat your clothing iron to the low or medium-low setting and place the iron on top of the cotton cloth. Leave the iron there for a few seconds at a time so the heat can draw out the stain-causing moisture from the mahogany; repeat this procedure a few times to remove as much of the stain as possible.
Place one spoon of mayonnaise and one spoon of cigarette ashes into a bowl. Stir the two ingredients together to create a water stain-removing paste. Spread the paste over the remaining water stain and rub it into the mahogany.
Wipe off the mayonnaise and ash mixture with a clean cloth. Repeat Steps 2 and 3 until the rest of the water stain is removed.
Pour a small amount of denatured alcohol onto a clean cotton cloth and add a few drops of raw linseed oil. Use the solution to clean and polish your mahogany table. Buff the surface to a shine with a dry cloth.
Prevent water stains, marks and rings by using coasters under glasses or hot dishes. Rub white toothpaste on your water stained table to remove the stain. Buff off with a clean cloth. Use furniture wax and fine grade steel wool to rub a water mark out of your table.