10 Best Cleaner For Trex Deck 2026 in the United States

Simple Green Pro HD Heavy Duty Cleaner Concentrate is a powerful, professional-grade cleaner designed for tough jobs, including grease, grime, and stains. It's a liquid concentrate that you dilute before use, making it versatile for many cleaning tasks beyond just decks—such as floors, industrial equipment, and vehicles. One of its strengths is that it’s biodegradable, which means it’s better for the environment compared to harsh chemical cleaners.

It’s also non-corrosive and safe on metal surfaces, reducing the risk of damage during cleaning. Being unscented is a plus for those who prefer no strong smells. Since it’s a heavy-duty product aimed at industrial use, it might be stronger than necessary for regular deck cleaning, so proper dilution is important to avoid any potential surface damage.

The application involves mixing with water and scrubbing or pressure washing, which may require some effort and equipment. While it’s effective at cutting through dirt and greasy buildup, it’s not specifically formulated just for TREX decks, so users should test a small area first. This cleaner is a solid choice for those seeking a versatile, environmentally friendlier product capable of handling a variety of tough cleaning tasks, though casual deck owners looking for a simple, ready-to-use deck cleaner might find it more involved.

The 30 Seconds Outdoor Cleaner 5 Gallon Concentrate is a liquid cleaner designed to cover large outdoor areas, including Trex decks. It is an organic formula, which means it uses natural ingredients and is likely safer for the environment compared to harsh chemical cleaners. This makes it a good choice if you’re concerned about eco-friendliness.

The concentrate form means you need to mix it with water before applying, which helps you clean up to 1,000 square feet, making it cost-effective for bigger spaces. Being a concentrate requires some preparation and measuring, so it might not be as straightforward as ready-to-use sprays. Also, the large 5-gallon container is quite heavy (86 pounds), which might be inconvenient to handle or store.

If you want a strong, environmentally conscious cleaner for your Trex deck and don’t mind mixing the solution yourself, this product fits well. However, if you prefer something lighter or pre-mixed for quick use, you might find it less convenient.

Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Concentrate is a liquid cleaner designed for outdoor surfaces including decks, concrete, siding, and roofs. It’s ideal for Trex decks since it doesn’t require scrubbing, rinsing, or pressure washing, making it gentle on composite materials. You mix it with water and spray on a dry surface, then simply wait for rain and wind to naturally wash away moss, algae, and mildew stains. The big plus is its ease of use—no hard work or special equipment needed—and it can keep surfaces clean for up to a year.

The product works gradually; light green stains may clear in 1-2 weeks, but tougher black or old stains could take several months, which might be frustrating if you want quick results. It’s fragrance-free and considered environmentally friendly, relying on gentle ingredients without harsh chemicals. One consideration is that you need dry, cool weather to apply it properly and no rain for a few hours afterward, which means planning ahead.

While it’s safe for wood and composite decks, patience is key since it cleans gradually rather than instantly. For those seeking a low-effort, long-lasting solution that won’t damage a Trex deck, Wet & Forget is a solid choice, especially if you’re not in a hurry and prefer an environmentally mindful product.