Protect outdoor spaces from unsightly mold, mildew, moss, and algae with these proven removers. The selections below cover hose-end, ready-to-use, and spray formulations designed for driveways, decks, siding, patios, and more. Each option emphasizes easy application, minimal scrubbing, and long-lasting results. Use the buying guide to compare formulas, application methods, and surface compatibility before you choose.
| Product | Brand | Format | Key Benefit |
|---|---|---|---|
| Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Outdoor Cleaner Concentrate | Wet & Forget | Concentrate (128 oz) | No scrubbing or rinsing; blends with water for broad-surface cleaning |
| 30 SECONDS Pro Mold And Mildew Stain Remover | 30 SECONDS | Ready-To-Use (32 oz) | 2X stronger formula; scrub-free results |
| Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Xtreme Reach Hose End | Wet & Forget | Hose End (48 oz) | Extends reach up to 30 ft; no rinsing |
| STAR BRITE Outdoor Collection All Surface Mold Stain & Mildew Stain Remover Spray | STAR BRITE | 32 oz Spray | On-contact stain removal; buffered-bleach for outdoor fabrics |
| 30 SECONDS Mold And Mildew Stain Remover (Battery Powered Wand) | 30 SECONDS | Ready-To-Use (1.3 gal) | Convenient power wand; immediate results |
Note: Each product listed above is designed for exterior surfaces and emphasizes ease of use, with many options not requiring scrubbing or rinsing. Consider the surface type, area size, and whether you prefer a ready-to-use spray, a hose-end application, or a concentrate for dilution.
Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover (128 oz) – Concentrate
Product: Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Outdoor Cleaner Concentrate, Original, 128 Fluid Ounces. Brand: Wet & Forget. Features include: removes green and black moss, mold, mildew, and algae stains with no scrubbing, rinsing, or pressure washing. Suitable for driveways, patios, roofs, siding, decks, vinyl, wood, concrete, canvas, aluminum, and upholstery. Mix 1 part concentrate with 5 parts water in a garden sprayer. Spray on a dry surface in cool weather, and avoid applying if rain is forecast within 4–5 hours.
30 SECONDS Pro Mold And Mildew Stain Remover – Ready To Use
Product: 30 SECONDS Pro Mold and Mildew Stain Remover | Scrub Free | Brighter Results Instantly | Ready To Use | 32 Fl. Oz. Brand: 30 SECONDS. Features include a 2X stronger formula and no scrubbing required, effective on bathrooms, decks, wood, vinyl, concrete, brick, and more. Designed to deliver brighter results quickly and safely around plants and lawns when used as directed.
Wet & Forget Outdoor Moss, Mildew, Algae Stain Remover (Xtreme Reach Hose End)
Product: Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Xtreme Reach Hose End with New & Improved Nozzle, 48 Fluid Ounces. Brand: Wet & Forget. Features include a hose-end application that reaches up to 30 feet, cleans moss, mold, mildew, and algae on roofs and siding, with a fan tip for driveways and decks. No rinsing is required; surface should be dry. Apply when no rain is forecast for 4–5 hours and temperatures are above 55°F. Stains may take weeks to months to fully disappear; long-established stains can persist longer but surfaces stay clean for up to a year or more.
STAR BRITE Outdoor Collection All Surface Mold Stain & Mildew Stain Remover Spray
Product: STAR BRITE Outdoor Collection All Surface Mold Stain & Mildew Stain Remover Spray – 32 OZ Spray. Brand: STAR BRITE. Features include quick stain removal on contact, easy spray-and-wait action, and a high-alkaline formula that removes mildew, lifts dirt, and cuts grease. Buffered-bleach technology makes it safe for marine and outdoor fabrics like Sunbrella, and it is designed to protect stitching and threads.
30 SECONDS Pro Mold And Mildew Stain Remover (2 Pack)
Product: 30 SECONDS Pro Mold and Mildew Stain Remover | Scrub Free | Brighter Results Instantly | Ready To Use | 32 Fl. Oz. (2 PACK). Brand: 30 SECONDS. Features include a brighter, instant result, no scrubbing required, and a formula that is 2X stronger than standard 30 SECONDS Outdoor Cleaner for tougher stains.
Buying Guide: Key Purchase Considerations
- Surface compatibility: Check whether the product is suitable for wood, concrete, fabric, vinyl, or metal surfaces. Some formulas are optimized for porous surfaces, while others are safe for outdoor fabrics like Sunbrella.
- Application method: Choose between concentrate, ready-to-use spray, or hose-end formulations. Hose-end offers convenient coverage for large surfaces but may require a longer application time before rinsing, while concentrates let you tailor dilution.
- Rinsing and weather window: Most products advise no rinsing and specify a window without rain for several hours. Verify local forecast patterns to maximize effectiveness.
- Stain type and persistence: Green stains (moss) often respond differently than black mildew. Some products are designed for quick elimination while others address deeply set stains over weeks or months.
- Safety and environmental impact: Consider plant and lawn safety, especially for concentrated formulas. Look for products with biodegradable components and clear safety directions.
- Surface longevity: Some products claim extended clean periods (up to a year or longer) but may require periodic reapplication to prevent regrowth on textured surfaces.
- Environmental conditions: Temperature and humidity influence performance. Many products specify minimum temperatures (e.g., above 32°F or 55°F) for effective use.