10 Best Cleaner For Trex Deck 2026 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.

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.

The Kärcher Wood Fence & Deck Cleaner is a highly concentrated liquid cleaner designed to be used with pressure washers, though it can also be applied manually or with a foam cannon. It works well on wood, composite (including Trex decks), and PVC surfaces, making it versatile for various outdoor decking materials. The formula is strong enough to handle tough dirt, grime, and even iron stains, and it rinses clean without leaving any residue, which is important for maintaining the appearance and safety of composite decks.

This product can make up to 40 gallons of cleaner from a single 1-gallon bottle, offering good value for larger cleaning jobs. Its fresh scent is a nice touch for outdoor use. While the cleaner is effective and designed for ease of use with multiple application methods, it requires a pressure washer or similar tool for best results, which might be a drawback for those without this equipment.

This cleaner is well-suited for homeowners with Trex or similar composite decks seeking a powerful, easy-to-rinse solution to refresh weathered surfaces.