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Composite and Trex deck washing became a priority this spring after I noticed mold on my composite decking and green buildup spreading across my boards. Like many homeowners, I believed composite deck cleaning meant never using pressure and that Trex deck care was mostly maintenance free. But the staining kept getting worse, so I contacted WashMyDeck deck cleaning to get clear answers.
My biggest question was simple: Can composite and Trex decks be pressure washed? Online advice was confusing. Some warned against any pressure, while others claimed composite deck maintenance wasn’t necessary. What I learned is that high pressure blasting can cause damage, but controlled, low pressure composite and Trex deck washing is both safe and effective. Mold on Trex decking and deck mildew removal require more than a quick rinse. The right process uses a specialized cleaning solution first, allowing it to break down buildup within the textured surface, followed by a gentle rinse to protect the material.
After reviewing photos and explaining their step by step method, the WashMyDeck team made it clear that proper composite deck cleaning is about technique, not force and routine maintenance keeps these decks looking new for years.
Many people use the words power washing and pressure washing as catch all terms. However, those words often imply high force cleaning. Because composite decking and Trex decking are engineered materials, high pressure can scar the surface and leave permanent marks. So when someone says “don’t pressure wash composite or Trex,” they are correct about that part.
What they often get wrong, however, is saying these decks don’t need regular cleaning.
Composite and Trex are two different product categories, yet they share similar traits. Both can develop mold and mildew and can trap organic debris, and they can show staining when neglected. In addition, growth can begin within the board texture, not just on top. As a result, once mold establishes itself, it becomes harder to remove with basic store cleaners alone.
Therefore, routine professional washing is still necessary, even though the material is more advanced than wood.
On the scheduled day, the WashMyDeck crew walked me through the process. First, they inspected the composite and Trex boards and pointed out the heaviest growth areas. Next, instead of using harsh pressure, they applied a proprietary cleaning blend made specifically for WashMyDeck. That formula is designed for both composite decking and Trex decking.
Because the cleaning solution does the real work, damaging pressure is not required. After proper dwell time, they rinsed using controlled, low pressure. Consequently, the mold and mildew lifted away without surface damage. Meanwhile, the finish of the boards remained intact.
They also explained that skipping annual composite and trex deck washing can lead to:
So although marketing sometimes suggests otherwise, these decks are not zero maintenance, they are lower maintenance when cleaned correctly and consistently.
Before service, my deck looked blotchy and tired. I assumed that was just normal aging. After the cleaning, the difference was obvious. The dark spotting disappeared, the green film was gone, and the board color looked more uniform. As a result, the entire outdoor space felt more inviting.
Neighbors noticed quickly. Some thought I had replaced sections. Others asked what product I used. Meanwhile, I noticed the surface felt cleaner and less slick, which made me more comfortable using the space again.
So can composite and Trex decks be pressure washed? Not with high, damaging pressure but yes, they absolutely can and should be professionally washed using the correct method. The common warnings are partly true; however, they leave out the risk of mold and mildew growth when decks are ignored.
Composite and trex deck washing should be done at least annually because biological growth starts within the material texture and becomes more stubborn over time. Therefore, safe professional cleaning protects both appearance and durability.
If you want straightforward pricing and scheduling, you can book ahead yourself or contact WashMyDeck through their website washmydeck.com, phone 703-583-9274, text 703-496-5113, or email info@washmydeck.com. From booking through the final rinse, my experience was smooth and the before and after results proved it was the right move.
WashMyDeck service areas include Fairfax, Alexandria, Burke, Springfield, Centreville, Chantilly, Clifton, Ashburn, Herndon, Loudoun and Prince William County!
Fairfax • Burke • Alexandria • Springfield • Centreville • Chantilly • Northern Virginia
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Yes! We’ve even cleaned the headstones at Arlington National Cemetery, tended the markers at the Columbarium, and preserved memorials at the Tomb of the Unknown Soldier and President John F. Kennedy’s gravesite.
At this time, we do not.
In 1994, before he could even drive, Steve was pushing a borrowed pressure washer through his Woodbridge neighborhood, deck by deck, neighbor by neighbor. No coupons, no gimmicks, just steady work and neighbors who spread the word.
Fast forward to today, and we have cleaned 50,000 + homes across Northern Virginia.
