Hardwood decking and siding are among the most durable exterior building materials you can buy. Species like Ipe, Cumaru, Tigerwood, Garapa, Brazilian Redwood, Teak, and other tropical hardwoods naturally resist rot, insects, and decay for decades.
However, if you want to preserve their rich, natural color instead of allowing them to weather to a silver gray patina, proper cleaning and maintenance are essential.
At AdvantageLumber.com, we’ve been supplying hardwood decking and siding for more than 30 years, and we’ve learned that the biggest factor in keeping hardwood looking beautiful isn’t the finish itself it’s the preparation.
Here’s the same maintenance process we recommend to thousands of homeowners, contractors, and architects every year.
Why Hardwood Turns Gray
Many homeowners assume a gray hardwood deck or siding means the wood is failing.
It isn’t.
The gray color is simply caused by UV exposure slowly breaking down the surface fibers. The wood underneath remains structurally sound.
If you enjoy the silver weathered appearance, no finish is required. Simply clean the surface periodically to remove dirt, mildew, and pollen.
If you’d rather maintain the rich brown, gold, or reddish tones hardwoods are known for, annual cleaning followed by a maintenance coat of finish is the best approach.
Should You Pressure Wash Hardwood?
Yes, but carefully.
Pressure washers are one of the fastest ways to clean hardwood decking and siding, but they’re also one of the easiest ways to permanently damage the surface when used incorrectly.
Unlike pressure treated pine or cedar, tropical hardwoods are incredibly dense. They tolerate pressure washing better than softwoods, but excessive pressure or incorrect technique can still erode the wood surface and leave visible marks.
Best Practices
- Use the lowest pressure necessary to remove dirt.
- Keep the spray tip moving continuously.
- Spray with the grain not across it.
- Maintain a consistent distance from the wood.
- Avoid concentrating the spray in one area.
Avoid These Common Mistakes
- Using a zero degree tip
- Holding the nozzle too close
- Washing across the grain
- Trying to remove deep stains with pressure alone
In our experience, homeowners often assume “more pressure equals cleaner wood.”
The opposite is usually true.
A properly applied hardwood cleaner does most of the work. The pressure washer should mainly rinse away loosened dirt not blast it off.
Step 1: Clean the Hardwood Properly
Before applying any finish, remove dirt, pollen, mildew, algae, old oxidation, and surface contaminants.
For hardwood decking and siding, we recommend using:
- DeckWise® Hardwood Cleaner Part 1
This concentrated cleaner is specifically designed for dense hardwoods and removes dirt, mildew, mold, and surface contamination while preparing the wood for finishing.
Pro Tip From 30+ Years of Experience
If the deck doesn’t look dramatically cleaner after rinsing, don’t immediately reach for more pressure.
Instead:
- Let the cleaner dwell according to the instructions.
- Scrub stubborn areas with a stiff bristle brush.
- Apply a second cleaning if necessary.
Chemical cleaning is much safer than excessive pressure.
Step 2: Brighten the Wood
Cleaning removes dirt.
Brightening restores color.
Many homeowners skip this step, but it’s one of the biggest differences between a professional looking restoration and a mediocre one.
After cleaning, apply:
- DeckWise® Hardwood Brightener Part 2
The brightener neutralizes the cleaner, removes tannin discoloration, restores the wood’s natural color, and prepares the surface to better accept a finish.
Let the Wood Dry Completely
This step is often overlooked.
Even dense hardwoods can trap moisture in their surface after washing.
Applying a finish too soon prevents proper penetration and can reduce the life of the finish.
Wait until the wood is thoroughly dry before applying any finish.
Warm, sunny weather usually speeds the drying process, while shaded or humid conditions may require additional drying time.
Choosing the Right Finish
AdvantageLumber.com recommends two premium finishing options manufactured by DeckWise.
The best choice depends on the appearance and performance you’re looking for.
Ipe Oil®
For homeowners wanting the richest, most natural hardwood appearance, DeckWise Ipe Oil® remains one of the industry’s most trusted finishes.
Benefits include:
- Deep penetrating oil formula
- Enhances natural hardwood color
- UV protection
- Minimal grain raising
- Designed specifically for dense tropical hardwoods like Ipe, Cumaru, and Tigerwood
Professional Tip
More oil is not better.
One thin, even coat almost always performs better than flooding the surface.
Dense hardwood simply cannot absorb excessive finish.
Any oil left sitting on top should be wiped away to prevent a sticky surface.
This is probably the single most common application mistake we see.
WiseCoat®
If you’re looking for a water based alternative with excellent water repellency, DeckWise WiseCoat® is another outstanding choice.
Benefits include:
- Water based formula
- Low VOC
- Water repellency
- Helps protect against moisture, mold, and decay
- Suitable for hardwood decking, siding, fencing, and other exterior hardwood applications
WiseCoat is especially popular with homeowners looking for longer maintenance intervals while still preserving the natural beauty of hardwood.
How Often Should Hardwood Be Oiled?
There isn’t a universal schedule.
Maintenance depends on:
- Sun exposure
- Climate
- Rainfall
- Foot traffic
- Wood species
South facing decks in Florida may need maintenance more frequently than shaded decks in the Northeast.
Instead of following a calendar, watch the wood.
If water stops beading and the color begins fading significantly, it’s time for another maintenance coat.
Waiting until the wood looks completely gray usually means more prep work later.
Hardwood Siding Maintenance
The same cleaning process works exceptionally well for hardwood siding.
- Clean with DeckWise Hardwood Cleaner Part 1
- Brighten with DeckWise Hardwood Brightener Part 2
- Allow the siding to dry completely.
- Apply either Ipe Oil® or WiseCoat® depending on your desired finish.
Vertical siding often requires less maintenance than horizontal decking because it receives less foot traffic and standing moisture.
Expert Tips We’ve Learned After 30+ Years
Clean Before It Looks Dirty
A lightly weathered deck is much easier to restore than one that’s been neglected for years.
Annual cleaning usually saves significant time during refinishing.
Don’t Chase Every Gray Spot
Small gray areas often indicate uneven weathering not finish failure.
Spot treatments can sometimes create a patchwork appearance.
Cleaning the entire surface before applying a maintenance coat generally produces more consistent results.
Shade Matters
Decks beneath trees often accumulate mildew faster than decks in full sun.
Even if the finish still looks good, periodic cleaning helps prevent buildup from becoming difficult to remove.
Avoid Household Bleach
Bleach can damage surrounding landscaping and doesn’t prepare hardwood for finishing as effectively as products specifically formulated for hardwood restoration.
Using the proper hardwood cleaner and brightener provides better preparation before applying a finish.
Don’t Wait Too Long
The easiest deck to maintain is one that’s maintained regularly.
A light annual cleaning and maintenance coat is almost always easier and less expensive than allowing years of weathering before attempting a full restoration.
Protect Your Investment
Premium hardwood decking and siding are designed to last for decades. A simple maintenance routine can keep them looking as beautiful as the day they were installed.
At AdvantageLumber.com, we recommend using DeckWise Hardwood Cleaner Part 1, DeckWise Hardwood Brightener Part 2, and finishing with either DeckWise Ipe Oil® or DeckWise WiseCoat® to properly clean, restore, and protect your hardwood surfaces.
Following this proven process helps preserve the natural beauty of tropical hardwoods while making future maintenance faster and easier. With proper care, your hardwood deck or siding can continue to be one of the most attractive and durable features of your home for many years to come.