The buildup of algae can turn even the cleanest and brightest surfaces into slippery, green eyesores. Whether it’s your patio, driveway, siding, or fence, algae growth isn’t just ugly, it can also be hazardous.
Traditional cleaning methods often involve hours of scrubbing and elbow grease. Fortunately, there are effective ways to remove algae without having to spend hours of manual cleaning.
In this article, we’ll explore how to get rid of algae from different surfaces without scrubbing, using safe and efficient methods that save time and energy.
1. Use an Algaecide or Outdoor Cleaner
There are commercial outdoor cleaners specifically designed to kill algae and mold. Look for products labeled as “no-scrub,” “hose-end sprayers,” or “spray-and-leave.” These cleaners often contain biodegradable surfactants and algaecides that break down algae at the root.
How to use it:
- Apply the solution generously on the affected surface using a garden sprayer or hose attachment.
- Let the product sit and work its magic—many formulas don’t require rinsing.
- Rain or natural weathering will usually wash the dead algae away within a few days or weeks.
Some of the popular cleaners include Wet & Forget, Spray & Forget, and Simple Green Oxy Solve Total Outdoor Cleaner.
2. Apply Vinegar or Bleach Solution
If you’re considering a natural and household solution, white vinegar can be surprisingly effective. For more stubborn algae, diluted bleach works well, especially on concrete or stone.
Alternatively, use Oxygen bleach (such as OxiClean) to remove the algae. It is a gentler alternative to chlorine bleach and is safe for most surfaces including wood, composite decks, and siding.
Here are the steps for the three methods:
White Vinegar Method
- Mix equal parts white vinegar and water.
- Test on a small area to ensure it does not damage the surface.
- Spray generously on algae-covered areas.
- Let it sit for 30 minutes to an hour.
- Rinse with a hose or light water pressure.
For the best results, spray the solution on a dry day as rain can cause drift.
Bleach Method (use with caution)
- Mix 1 part bleach to 3 parts water in a pump sprayer.
- Apply carefully, avoiding plants or grass.
- Let sit for 10–15 minutes.
- Rinse thoroughly with clean water.
Avoid using bleach on wood or porous surfaces, and always wear protective gloves and eye protection.
Oxygen-Based Cleaners
- Mix the powder with water as per the directions.
- Apply with a pump sprayer.
- Let it sit for 20–30 minutes.
- Rinse off with a hose and no scrubbing is required.
It is helpful, especially for removing algae in ponds and water features.
3. Use a Pressure Washer
If you’re looking to speed up results, a pressure washer is one of the easiest ways to remove algae without scrubbing.
It doesn’t require chemicals (though a mild detergent can help), and it’s great for hard surfaces like walls, driveways, patios, and bricks.
Tips:
- Use a wide spray tip to avoid damaging surfaces.
- Keep the nozzle a few inches from the surface.
- Avoid pressure washing wood or delicate materials at high PSI.
Make sure to dry out the dampness from the areas because even the smallest moist conditions can encourage algae regrowth.
4. Apply Salt
Sprinkling rock salt or a strong saltwater solution on algae-covered concrete can dehydrate and kill the algae. However, it may take repeated applications and can damage nearby grass, plants, or soil.
Here are the directions to follow to ensure safety and effective algae control:
- Sweep the area to remove dirt, debris, and loose algae
- Sprinkle a generous amount of rock salt or saltwater solution over the algae-covered areas.
- Lightly spray the area with water (if you prefer rock salt) using a watering can or spray bottle.
- Allow the rock salt or saltwater solution to sit for 12–24 hours.
- Rinse the area with a hose to remove dead algae.
Note that salt can kill grass or plants nearby. Make sure to cover the grass or flower beds to prevent salt runoff.
Lead Editor for Insight Weeds.