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 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.

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.