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Removing green algae with green soap: pros, cons and alternatives

Green soap is often used against green algae, but does it really work? Discover the pros and cons and better alternatives.

Close-up of a scrubbing brush on a wooden deck

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Green soap is often used as a natural way to remove green algae from patio tiles, wooden decks or natural stone. Green algae often appears on surfaces in damp places, especially during a wet autumn or the dark winter days. Although green soap seems like a natural cleaning product, it has both pros and cons. In this article, we discuss all the pros, cons and alternatives.

Removing green algae with green soap: what you need to know

Pros

  • More environmentally friendly than chemical products: it contains fewer harsh substances and is biodegradable.
  • Easy to use: easy to mix with water.
  • Cheap and accessible: it is available everywhere and affordable.

Cons

  • Not powerful enough: it only removes surface deposits. Stubborn deposits, such as deep-rooted algae and moss, often remain.
  • Leaves residue: after use, a greasy film can remain, which makes new deposits come back faster.
  • Labor-intensive: removing green algae with green soap often requires a lot of scrubbing, which can be time-consuming.

A better alternative

For a more efficient and environmentally friendly approach, Osmo Terrasreiniger is an excellent alternative. This product is specially developed to remove green algae from wooden decks and patios.

Why choose Osmo Terrasreiniger?

  • Thorough: it completely removes green algae and moss.
  • Environmentally friendly: you dilute the cleaner with water, from 1:25 to 1:1 depending on how dirty the surface is.
  • Economical: just 1 liter can clean up to 100 m².
  • Easy to apply: use the cleaner with the Osmo patio brush.
    With Osmo Terrasreiniger you clean your wooden surface without the drawbacks of soap.

Videos: Removing green algae with green soap

In these videos you will see how to remove green algae from wood and why green soap is not good for wooden decking.

Groene aanslag verwijderen: hoe verwijder ik groene aanslag?

Groene aanslag verwijderen: hoe verwijder ik groene aanslag?

Waarom groene zeep niet goed is voor jouw houten terras

Waarom groene zeep niet goed is voor jouw houten terras

Step-by-step plan: removing green algae

Ready to remove the green algae? Here is a handy step-by-step plan so you can get started right away.

1

Prepare

  • Clean your deck with the Osmo patio brush. Ideal for removing surface green algae in advance.
  • Check that there is good drainage to reduce damp spots.
Sweeping the deck
2

Apply

  • Mix Osmo Terrasreiniger with water in a ratio of 1:25 for light deposits, or use it 1:1 for stubborn deposits.
  • Apply it with an Osmo patio brush and spread the product evenly over the surface.
Terrasreiniger in a bucket
3

Let it work

Let the cleaner work for 10 to 15 minutes. This gives the product time to loosen green algae and dirt.

Let it work
10 to 15 minutes
4

Rinse

Rinse the deck clean with water. Do not use a pressure washer, as it can damage the wood.

Rinsing with water

Supplies

Follow-up treatment

After removing green algae with Osmo Terrasreiniger, you can give the surface extra protection by applying a suitable protective finish. This keeps the surface looking good for longer and makes it easier to keep clean. Depending on the material, choose one of the following products:

  • Osmo Terras-Olie: ideal for horizontal wooden surfaces such as decks and patios. This oil offers long-lasting protection against moisture and dirt.
  • Osmo Steen en Terracotta Olie: suitable for patio tiles and stone surfaces. This oil helps protect against dirt and moisture.
  • Osmo UV-Beschermingsolie: perfect for vertical wooden surfaces such as fences and cladding. This oil prevents graying caused by UV radiation.
    Note: wait at least 24 hours after cleaning, until the surface is completely dry, before applying a new protective finish.

Maintenance advice

To keep your deck or wooden surface in top condition and prevent green algae, regular maintenance is essential:

  • Clean twice a year: use a mild solution of Osmo Terrasreiniger in spring and autumn to prevent green algae.
  • Check the protective finish: touch up the protective finish with the recommended Osmo products if necessary.
  • Remove dirt regularly: sweep the surface with a stiff broom to remove sand and leaves and avoid damp spots.

With this maintenance routine, your deck or wooden surface stays clean and protected against green algae.

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