How to Remove Green Algae from Wood Deck 

 December 16, 2020

By  Dale Keese

After a long and wet period during which you could not use your wood deck as much as you would have liked, it can be annoying to step out and see that your deck does not look as good as you thought. If you do not take care of the wooden areas regularly, it is very easy for the deck to develop unwanted mold and green algae.

Summer House Exteriors

This algae does not only look bad to the human eye but also it can be a health hazard as it makes the wooden deck slippery and exposes people to the risk of falling as they try to walk around the deck.

If you are wondering how to remove green algae from a wood deck, you have come to the right place. While algae removal may seem like a difficult task, you would be surprised to know that all you need are some basic, good-quality equipment and a few hours of your day to restore your wood deck to its former glory. More importantly, you need a good understanding of the steps on how to clean deck wood for the best possible end results.

Here, we will first talk about the things you need to clean algae followed by how to clean decks.

When homeowners step out of their house and see green algae on their decks, their first thought would be how to remove this green algae from their wood deck.

The process is very simple, but before you get started, there are some basic things that you need to collect. Gathering these wooden deck cleaning materials beforehand will prevent any waste of time when you are in the middle of the process because everything you need will be within reach.

Cleaning Bucket with Soapy Water

The most important of these are mentioned below, but you can edit this list according to your individual preference.

  • Broom
  • Water
  • Bucket
  • Some protective gear like rubber gloves
  • Oxygen bleach
  • Acid or bleach-based deck cleaner
  • Deck sealer
  • Scrub brush
  • Garden hose

Step-By-Step Guide for Removing Green Algae from Your Deck

Algae are basically just a collection of microscopic plants that grow where sunlight and water are readily available. While algae are most common in water sources, it can also grow on your wooden deck, especially in cases when the wooden deck has remained wet for a long period of time.

As these organisms are very resilient, they can sustain themselves through a wide range of climatic conditions. If you are wondering how to remove green algae from the wood deck, there are some instructions that you must follow closely. These are listed below.

Step One — Clear the Deck of Furniture

The first thing that you need to do when you want to remove algae from your wooden deck is to clear the area by moving all the furniture on the deck’s surface. In order for the wood deck to be cleaned well, all your deck chairs, tables, swings, or any such furniture or fixtures need to be removed and stored somewhere safe, away from the materials that you are going to use to remove algae and clean the wooden deck.

The acid or bleach-based cleaner can cause some long standing damage to all the outdoor furniture that you have if you let them remain on the wooden deck while you are cleaning.

Step Two — Sweep Debris off the Surface

To clean wooden decks effectively and thoroughly, it is important that the wooden surface has been prepared well for the materials that you are going to use on it. If the deck has been out of use for a while, it is probably going to have a lot of leaves, gravel, and other elements just lying around. You need to use a broom to sweep the entire wood deck vigorously. This will ensure that a large amount of dust and dirt is removed before you start.

Wood Surface Debris

Step Three – Make Solution with Bleach

Fill a bucket with warm water to about ¾ of its capacity. Then, add two cups of high-quality oxygen-based bleach to the water. You need to be very careful when you are dealing with chemicals like bleach, so make sure you are safe by wearing a mask, rubber gloves, and protective clothing.

Step Four – Time to Scrub and Rinse

Once you are sure that you have adequate protection, you need to get your hands on a good-quality scrubbing brush and use the bleach solution to move across the wood deck as you scrub the surface vigorously. This is a very important step in cleaning wooden decks and the bleach solution needs to be given some time—usually between 10 and 30 minutes—to start working. This is the chemical that will kill and remove algae and mold that has built up across your wood deck surface.

Once you are sure that you have given it enough time, rinse the entire surface using a garden hose.

Step Five – Pull out the Deck Cleaner

Once you are done with the bleach, you will have to use a specialized deck cleaner to do a more in-depth cleaning of the wood deck. These cleaners are usually acid-based or bleach, so you can check which one suits your needs best.

Most of these deck cleaners have to be mixed with some amount of water before you can apply it to wood decks, so be sure to read all the instructions very carefully. It should be allowed to set for a while so that you can get rid of all the algae. Use the scrub brush again and give the wood deck a thorough cleaning.

Dog Playing with Garden Hose

Step Six — Rinse Well

Once you are satisfied with how clean your wood deck is looking, it is time to use your garden hose to give it a good rinse. This will be helpful in removing the cleaners and bleach, which can cause a good amount of damage if they are just left there. It is important to ensure that all parts of the wood deck and nearby areas are hosed down so that there is no cleaning solution left.

Step Seven — Sweep the Deck

Pick up your broom once again and sweep the deck wood well so that there are no product or water pools left around on your deck. If there is water left around and on the deck, it will act as a breeding ground for algae all over again. Once the water pools and puddles have been swept away, you can just air dry the entire deck.

Step Eight – Consider Deck Sealers

A good deck sealer can be a savior for people who want to keep their wood decks looking good as new and o avoid the growth of mold, mildew, or algae on the surface. Most good-quality deck sealers also provide UV protection.

Outdoor Rocking Chair

Step Nine – Set up Your Deck

If you have sealed your wood deck after cleaning it well, it is time for you to set it up again. Ensure that the deck wood is completely dry before you start putting all the furniture and other fixtures back on the deck and enjoy your summer out in the sun!

If you were wondering how to remove green algae from the wood deck, the process has been simply outlined for you to follow. To remove algae, just make sure that you keep the deck clean and prevent any water buildup in the future by sealing the wood deck well!

About the author

Hey, I'm Dale Keese.. thanks for reading.. hopefully this article can save you some time and trouble with your sealing job. I'm also in the process of making some video walk-throughs for youtube so check back soon! thanks

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