Maintaining a pristine composite deck often hinges on choosing a wash-safe cleaner that removes stains without harming the deck’s surface. The following selections are formulated to tackle moss, algae, mold, and deep-set stains while staying gentle on Trex, TimberTech, Fiberon, and similar composites. Below, you’ll find concise product overviews, a quick comparison table, and a buying guide to help you decide which cleaner best fits your outdoor space.
| Product | Brand | Key Benefit |
|---|---|---|
| Wash Safe Spray & Clean | Wash Safe Industries Store | Deep-set stain removal with minimal bleach |
| Concentrated Composite & Wood Deck Cleaner | DeckMAX Store | High coverage, safe for kids and pets |
| TIMBERTECH Composite DeckCleaner | TIMBERTECH Store | Versatile, biodegradable formula |
| STAR BRITE Non-Skid Deck Cleaner | STAR BRITE Store | UV protection and surface safety |
| Simple Green Oxy Solve Total Outdoor | Simple Green Store | Peroxide-powered stain lifting for multiple surfaces |
Wash Safe Spray & Clean Commercial-Strength Deck Cleaner

Washer Safe Spray & Clean is designed to tackle deep-set stains on composite decking with a formula that is non-hazardous and only uses a minimal amount of bleach. It cleans without discoloring or damaging the surface, helping to preserve the deck’s appearance over time. The product penetrates the pores of the deck to remove stubborn stains and is particularly effective on moss, mold, algae, and lichen. No scrubbing is required thanks to its 5% chlorine bleach blend and surfactants, which transport cleaning agents into the pores for efficient stain removal. Suitable for Trex, TimberTech, Fiberon, and Calibamboo, this cleaner offers a strong cleaning action with reduced effort.
Concentrated Composite & Wood Deck Cleaner

This professional-grade deck cleaner and mildew remover is formulated to address black and green stains, mold, and heavy grime on both wood and composite surfaces. It cleans a broad range of decking brands and covers up to about 1,500 square feet per application, offering significant value for larger projects. The product is described as safe and eco-friendly, with zero VOCs and no harsh solvents, making it suitable for families, pets, and nearby plants. Manufacturers and contractors commonly recommend it for Trex, TimberTech, Fiberon, and similar decking systems.
TIMBERTECH Composite DeckCleaner

TimberTech’s DeckCleaner is a versatile option that works for entire decks or targeted spots. It is concentrated so that one gallon of cleaner yields about four gallons when properly diluted, enabling cleaning of roughly 1,000 square feet. The formula is biodegradable, aligning with eco-conscious cleaning practices. This cleaner is positioned as effective for removing dirt, grime, and spills while preserving the deck’s materials and finish, especially on composite surfaces like TimberTech boards.
STAR BRITE Non-Skid Deck Cleaner & Protectant

This non-skid deck cleaner is designed for easy cleaning without extensive scrubbing. It also leaves a UV protective coating intended to repel future dirt and stains, helping to shield surfaces against UV damage. The formula is described as safe for a variety of materials, including fiberglass, vinyl, rubber, plastic, metal, and painted surfaces, making it a flexible option for boat decks and other outdoor areas that respond well to a protective finish.
Simple Green Oxy Solve Total Outdoor Cleaner

Simple Green Oxy Solve Total Outdoor Cleaner uses peroxide power to lift dirt, grime, and stains from multiple surfaces, including wood, composite, vinyl, metal, fabric, plastic, wicker, concrete, stone, brick, and asphalt. This cleaner emphasizes its ability to lift mold, mildew, moss, and algae with less reliance on harsh chemicals. It is a broad-spectrum option suitable for homeowners who want an all-in-one solution for outdoor cleaning tasks around the home and deck areas.
Buying Guide: Key Purchase Considerations
- Material compatibility: Look for cleaners specifically labeled safe for composite decks and the brands you use (Trex, TimberTech, Fiberon, etc.).
- Stain type and depth: For black stains from moss, mold, and algae, choose formulas designed to penetrate pores and lift deep-set marks without scrubbing.
- Eco and safety profile: If you have children, pets, or nearby plants, prioritize zero-VOC and biodegradable options with minimal harsh chemicals.
- Application and coverage: Consider concentrated formulas for high coverage per purchase and read dilution instructions to achieve the right cleaning strength.
- Surface protection: Some cleaners offer protective coatings or UV resistance to reduce future staining; weigh this against the need for immediate stain removal.
- Environmental impact: Favor products that minimize chemical runoff and do not degrade the deck’s finish or color.
- Ease of use: No-scrub formulas save time and effort; verify if the product requires rinsing and the recommended rinse duration.
- Brand reputation and warranty: Select cleaners backed by reputable brands with clear usage guidance and compatibility notes.