10 Best Cleaner For Trex Deck 2025 in the United States

The Oxy Solve House and Siding Pressure Washer Cleaner is a liquid concentrate designed to clean various types of outdoor siding, including vinyl, aluminum, wood, brick, and stucco. It effectively removes stains caused by mold, mildew, algae, and moss, making it suitable for keeping Trex decks and similar surfaces looking fresh. The main cleaning power comes from peroxide, which breaks down grime without using harsh chemicals, resulting in a safer and more environmentally friendly option.

This non-toxic and unscented formula reduces the risk of irritation and is preferable to traditional cleaners that contain strong chemicals. Being a concentrate, it can cover a large area—up to 6,400 square feet when used with a pressure washer—allowing for efficient cleaning. Application requires a pressure washer, so some familiarity or equipment is needed, but this method generally provides a quicker and more thorough cleaning compared to scrubbing by hand.

Users have rated the product positively for its effectiveness and ease of use. It is specifically designed for siding and deck materials and may not be suitable for delicate surfaces. This cleaner is well-suited for homeowners seeking an environmentally safer and powerful solution to remove mold and mildew stains on outdoor deck materials like Trex, provided they have access to a pressure washer for application.

The Simple Green 13005CT is a concentrated industrial cleaner and degreaser that works well on various surfaces, including those similar to TREX deck material. Its strength lies in removing tough dirt, grease, and stains, which can be helpful if your deck has heavy grime or stubborn spots. Since it’s a concentrated liquid, you can dilute it to match the cleaning task, making it cost-effective and versatile. The application is flexible—you can use it by hand or with cleaning machines like pressure washers or scrubbers, which might be useful for larger decks.

The cleaner is biodegradable and recognized by the EPA's Safer Choice Program, indicating it’s safer for the environment compared to harsh chemical cleaners. It also has a mild sassafras scent, which some may find pleasant. However, as an industrial-strength degreaser, it might be stronger than needed for regular TREX deck maintenance, and overuse or improper dilution could affect the decking surface or nearby plants. The product is liquid, which makes it easy to apply but requires some care to measure and dilute properly.

If you prefer a ready-to-use cleaner or something specifically designed for composite decking, this might feel a bit more heavy-duty than necessary. Simple Green 13005CT serves as a powerful, eco-friendlier option for deep cleaning TREX decks, especially when dealing with tough grime, but casual or frequent cleaning might call for a gentler alternative.

The Wet & Forget Xtreme Reach Hose End Refill is a liquid cleaner designed to remove moss, mold, mildew, and algae stains from outdoor surfaces like roofs, siding, patios, and decks, including TREX composite decking. It’s applied by attaching the refill bottle to a garden hose, allowing you to spray up to 30 feet away with either a concentrated jet or a wide fan spray. This makes it easy and convenient to cover large areas without heavy scrubbing or rinsing.

One of its main strengths is the low-effort application—just spray it on a dry, cool surface without rinsing, then let wind and rain gradually wash away stains. This can save time and physical work compared to pressure washing or scrubbing. It’s bleach-free and non-acidic, which reduces the risk of damaging TREX decking and is safer for the environment if used responsibly (avoiding water bodies and rinsing nearby plants). However, its cleaning action is slow and gradual, with light green stains clearing in 1-2 weeks, but tougher black or older stains may take several months to fully disappear. This means it’s not ideal if you want instant results. Also, heavy or porous surfaces absorb more product, so you may need multiple treatments for heavily stained decks.

The product covers up to 2,000 square feet per bottle and is unscented, which is nice if you prefer no strong smells. Its simple hose attachment and spray method make it very user-friendly for homeowners without special equipment. Wet & Forget Xtreme Reach is a good choice if you want a gentle, low-maintenance cleaner for TREX decks that works over time and is environmentally mindful, but it may be less suitable if you need fast stain removal or have heavy, deeply ingrained stains requiring immediate attention.