Can you pressure wash cedar siding? Yes, you can pressure wash cedar siding by using a low PSI pressure washer or adjusting a pressure washer to its lowest PSI setting. This protects the cedar from being damaged from too high of pressure because it is softwood.
The Cedar Bureau recommends using a solution no stronger than one-part bleach to three parts water. Apply it with a pump sprayer and let it sit for about 15 minutes before rinsing it off with a garden hose. Be sure to keep the hose pointed downward to avoid forcing water up behind the shingles.
It is highly recommended that you treat the mold and mildew on your cedar siding before going at it with a pressure washer or brush and bucket. Honestly, your efforts will be futile if you scrub or blast away the dark spots without killing the mold first.
For instance, you might be tempted to clean wood siding with a pressure washer, thinking it would make quick work of things. Do so at your own risk. Using such a high-powered tool can actually cause several types of damage, including stripped paint, gouged boards, and loosened caulk.
The best way to restore your cedar siding or cedar fence to its original glory is with soft washing. Instead of the robust streams of high-pressure water used in pressure washing, soft washing uses a low-pressure technique with a special mixture of highly effective and biodegradable cleaning solutions.
You simply keep the wood siding wet with the oxygen bleach solution for 15 minutes. It will remove the mildew and deep-clean the siding. Lightly scrub the siding before rinsing with clear water from a garden hose. Avoid the temptation of using a pressure washer.
Clean wood siding with a garden hose
When using a garden hose, it is recommended to use a solution of water and cleaner, which is often a mild detergent, and scrub the siding with a sponge, cloth or a soft-bristled brush. Be careful not to push too hard with a brush as this can damage the siding.
Pressure washing will easily power away all the mold spores along with any debris/dirt that hides on your deck. However, too much pressure may damage the surface, leaving it fuzzy. Just stick to the directions that come with the device and you'll soon find your deck cleaner than it's been in years.
Cedar siding needs to be repainted every 5-7 years, but if you take some special precautions, you can get up to 10 years from one paint application. In order to do this though, you will need to ensure that you are properly preparing the surface and considering all the environmental factors.
Like other types of external siding, cedar is prone to accumulation of dust and dirt. You have to clean it twice a year to keep it easier. Use a soap and water solution for general cleaning to scrub the siding and then wash it down. You can use some bleach if you have mold and mildew problems.
The first thing you need to do when restaining cedar siding is to clean the surface. Mix one part bleach with four parts water and use it to wash the surface with a damp cloth to remove any dirt and reveal the wood finish. Afterwards, rinse the surface with a second damp cloth and pat the siding dry with a dry cloth.
Power washing can be used to clean cedar as long as the sprayer is set at a low pressure to prevent damaging the wood's soft surface. Once cleaned and allowed to dry, the wood can then be painted using a urethane-acrylic house paint.
A good “rule of thumb” is to clean vinyl siding every 2 to 3 years. It's not recommended that you go longer than just a few years without power washing, as homes might hold lots of dust and debris that homeowners overlook, and pressure washing also cleans away bothersome insect nests and termite tunnels.
The most common culprits are tannins, mildew, and mold. Tannins ordinarily leach from cedar wood, and do not normally cause any problems. However, when tannins mix with metal and iron, a chemical reaction occurs and a black stain can form. Cedar, along with any other wood, is a natural habitat for mildew and mold.
Mix the powdered bleach according to directions on the bottle, such as 4 parts water to 1 part powder. Apply the solution with a clean garden sprayer, allowing it to soak for 15 minutes. The bleach will remove much of the discoloration. Use a nylon-bristled scrub brush to remove the rest.
While there are many deck cleaners available on the market, we have found a solution of warm water, TSP (trisodium phosphate), and a small amount of bleach (or powdered oxygen bleach like Oxiclean) to work really well and be very cost-effective.
Wash the siding area with the pressure washer. Insert the detergent tip, which is often black, into the pressure washer wand and apply detergent as needed. Rinse the siding using the pressure washer and clean water as a final step. Use a soft bristled brush attached to an extension pole to clean heavily soiled areas.
Blend a moss-killing solution appropriate for the siding material. For wood or aluminum siding, combine one-third cup powdered laundry detergent, two-thirds cups trisodium phosphate, 1 quart bleach and 3 quarts water. For moss on vinyl siding, create a solution that contains 30 percent vinegar and 70 percent water.
You can use water mixed with a bit of mild detergent for a basic cleaner. If you need a stronger cleaner, you can dilute bleach with water for a cleaner that will accentuate the natural luster of the cedar. This is particularly effective in the removal of mildew. Wipe the wood gently, and avoid excessive scrubbing.
One part white vinegar to 3 or 4 parts water is fine. Dip a sponge in the vinegar solution, and wipe it on the bleached wood. Rinse the sponge in clear water before dipping it again in the neutralizing solution. Once the cedar is dry, you can leave it as is or apply the finish of your choice.
Cedar wood is used for decking, siding, fencing and furniture and can enhance the appearance of a home with its smooth and colorful wood grain appearance. You must take care to keep your cedar objects clean and dry, because this wood can develop mold if not properly maintained.