Outdoor Algae Stain Remover

Outdoors, green film and black streaks running with the rain are usually algae. Black dots in indoor bathrooms are usually mold; use a mold stain remover there.

Bleach works fast but fades colored paint and wood and harms plants. This is chlorine-free and better around colored surfaces and gardens.

No. Organic acid reacts with the calcium carbonate in marble and dulls it. Use a neutral stone cleaner.

Spray the algae, let it sit 15 to 20 minutes, scrub, and rinse well. The dwell time lets the acid and wetting agents work into the slimy layer algae use to cling, so the color comes off with the scrubbing, not just the surface film. On a wood deck, scrub with the grain and test a hidden spot first. For large areas, dilute 1:4 with water, and skip hot, sun-baked surfaces.

Yes. Spray, wait, scrub with the grain, rinse, and let it dry. Test a hidden spot first for color and coating.

In shady, damp spots algae slowly returns; cleaning in spring and autumn is typical. Better drainage and airflow stretch the interval.

Diluted small amounts have limited impact, but keep runoff out of beds, ponds, and waterways where you can.

Put diluted solution in a sprayer with an extension wand, spray bottom-up, then scrub with a long-handled brush and rinse top-down. Above the first floor, have professionals use proper access equipment.

Wet walls always look uneven—judge once fully dry. Reapply and scrub any spots that still show green after drying.

Yes—rinse at low to medium pressure after the dwell, which is faster than scrubbing. Keep the nozzle back from painted walls and old mortar so you don’t strip them.

No. It's not for ponds, fountains, or any water feature. Use it only on hard outdoor surfaces like patios, walls, fences, and statues, and keep rinse water out of nearby ponds and basins. For algae in water, use a product made for fountains or ponds.

Only briefly. Metal shouldn't stay in long contact with this acidic formula, so spray, scrub, and rinse metal promptly rather than leaving it for the full dwell time. Rinse any overspray off railings, hinges, and furniture legs near the area you're treating.

Three things: whether “chlorine-free, gentle on colored surfaces” leads the pitch, ready-to-use or concentrate, and your market’s rules on outdoor algae claims. Claim algae stain removal and check by market before any kill claim.

Free samples are usually ready in 3–5 days. Standard MOQ is 500 bottles, and bulk orders are scheduled after packaging and labels are approved.

All of it: formula direction, scent, fill size (500 mL spray, 1 L refill, and more), mist or foam trigger, label design and language, and ecommerce bundles with a stiff brush and pump sprayer.

Yes, we ship samples first. Test them on algae-covered painted panels, wood boards, and concrete samples like the ones your customers handle, and record green and black algae removal, effect on colored coatings and wood, and regrowth time. That tells you more than a before-and-after photo.

We provide SDS/MSDS, a TDS, and batch COAs, plus bilingual label content for your target market. They aren’t posted publicly; we send them per project on inquiry.

Pricing is tiered by packaging, trigger or cap, label, and order quantity, starting at the 500-bottle MOQ. Send your target quantity, fill size, and packaging needs, and we’ll quote unit prices by volume tier with sample and lead-time details.