Because it has the potential to last long, withstand the elements and resist insects and decay, hardwood can be a smart investment. Left alone, the natural color of hardwood garden furniture -- like pieces made from shorea, teak or ipe -- will weather to a soft, silver grey. This process will take 6-12 months, depending on the climate in which you live and the amount of exposure to the elements. Those imperfections that are inherent features of the wood will become more pronounced over time, giving the garden furniture a rich, natural beauty. In humid, wet or subtropical climates that experience frequent rain, hardwood furniture may expand and contract -- causing the grain to rise. This is a normal part of the weathering process for outdoor wood furniture.
When you set up a new piece of shorea outdoor furniture, lightly spray it with water to remove any dust. Sometimes, all that is needed is a light seasonal cleaning. To do so, rinse the shorea furniture with a light spray from the hose. Dip a sponge or soft-bristle brush into a mixture of mild detergent and water. Scrub lightly and evenly. Rinse again, with clean water. Allow to dry completely.
If you desire to return your shorea furniture to its original warm brown color, use a high-quality hardwood or teak oil each season to maintain and preserve its color. Before applying, test the oil on a small, inconspicuous area, rub it in with a soft cloth or paintbrush, allow to dry and see if you like the color and finish. If so, continue to apply oil, distributing it evenly with a cloth or soft-bristle brush.
I recall my neighbor suggesting we borrow a power washer to knock off all the embedded dirt and oil residue. Using a hose nozzle with a strong spray, I tested the technique on one chair. It worked -- dirt was blasted right off. As I continued, I decided to use the liquid dish soap and water mixture beforehand to loosen the dirt. After more hose blasting, the dining set looked remarkably better -- and this was just the initial step.
After allowing the furniture to dry overnight, I took an ergonomic light-grade sandpaper tool to it, one section at a time, over the next few days. Even better! A quick spray with the hose removed any dust from the furniture. Again, I let it dry overnight. The next day, I applied teak oil with a soft cloth, rubbing in the direction of the woodgrain. It worked: the teak dining set was no longer that splintery-looking behemoth on our deck -- it was actually something we used. Regular applications of hardwood oil help maintain its health and beauty. And -- judging by the amount of use the dining set has gotten since I sanded and deep-cleaned it -- it was well worth the effort.