Getting Rid of Moss and Algae on Concrete

September 4, 2012

Moss between concrete brick pavers.A couple of years ago I asked how to remove green algae from my concrete steps and driveway. Someone recommended a solution of vinegar and something else. Unfortunately, I forgot the something else. All I know is that it worked. Please help. Thank you.


By Cindy S.


September 10, 20120 found this helpful

You could use vinegar straight or mixed with water. You could also try bleach and water in a ratio of 2 parts bleach and 1 part water or any ratio. Be sure to wear eye protection around bleach. And you might have to scrub the moss and algae with a brush. You could also try pressure washing but not with bleach. Or try some products made to remove moss and algae from a big box store.

August 30, 20160 found this helpful

baking soda

October 11, 20160 found this helpful

I have been told that vinegar n Epson salt dissolves is good for plumbing n many more task try that I'm going to try although give a good rinse when done

November 8, 20160 found this helpful


February 24, 20172 found this helpful

Vinegar and baking soda

June 25, 20170 found this helpful

Possibly Dawn dish soap

October 7, 20170 found this helpful

I had algae on my concrete patio. I sprinkled the green area with baking soda then sprayed vinegar over the area covered in soda. I waited about 15 - 20 minutes and scrubbed it with along handle (deck type) brush. Occasionally rinsing my brush in a pail of water, I could see the green algae in my rinse water.


Finish by rinsing with a water hose or buckets clean water.

October 22, 20190 found this helpful

Enzyme cleaner, even for puppy urin; it should come with a concentrate, gallon jug and a smaller spray version that you hook the hose up to allowing you to spray the perfect ration all over your surface.

Whats fabulous about using enzyme cleaner? Everything! Its harmless, practically digestive enzymes that break down organic material, such as pet urine, mold, fecal stains.... spray generously in the am and by the time the sun dries it all away, your pool deck, drive way, ROOF TOP whatever will be white. Or st least should be. Sand isnt organic material, but the nasty stuff, including the mold, get eaten away.

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This page contains the following solutions.

October 26, 2011

Spread some lime over the area to get rid of the moss, or a cheaper method if you have a fireplace is to lightly spread some of the ashes over the area. If you wet it down, it sort of makes the gray disappear, but it gets rid of the moss.


5 More Questions

Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.

April 27, 2010

How do you get algae off of concrete?

By jim from Australia


April 28, 20100 found this helpful

Bleach and a scrub brush.

April 30, 20100 found this helpful

Its caused because of dampness, try painting over it.That's what I did.

January 14, 20160 found this helpful

Ammonia solution works wonders for me

September 21, 20160 found this helpful

Can I spread farm lime over driveway?

November 18, 20160 found this helpful

How do you get algae off concrete

February 8, 20170 found this helpful

I concur. Painting over algaea is the most stupid, thing I ever heard of, when all you have too do is wait for the sun to be hitting the affected area, and bleach ,then rinse,and rinse,and rinse!!

February 10, 20170 found this helpful


May 1, 20171 found this helpful

I guess you can paint over the concrete once you get rid of the moss.

May 7, 20170 found this helpful

I was told Ammonia with a soapy solution is used to clean canvas canopies and boat covers instead of remaking the canopies and covers. A wide broom an be used as a brush.


DON'T mix bleach and ammonia or you'll create poison gas. DON'T use bleach at all. This should work on concrete too.

May 13, 20170 found this helpful

There is a positive to painting over concrete. Many people do it in their basements. Painting over it works as a sealant, as water (any moisture) can soak into concrete therefore leaving it open to algea or mold growth. Please don't be so quick to judge something before have a better chance of learning that way! Hope that answered your question as to why!

November 20, 20170 found this helpful

You can paint over the concrete after you remove the stuff. The Dry Lock Masonry Concrete paint locks in the moisture and can last for a couple years.


The Paint is very thick so it requires a big strong paint brush or roller; I used the gray color, looks great when done.

November 20, 20170 found this helpful

Certainly ou can paint concrete, just remove the yukky stuff first!

April 7, 20180 found this helpful

Don't bleach in direct sunlight as UV breaks down the chlorine quickly,gives it a longer reaction time too.

July 2, 20180 found this helpful

It is so stupid painting over concrete it would make it more slimey .

February 14, 20190 found this helpful

I have painted all my garden walls. A nice white to make the small garden welcoming and bright as the grey is dull and boring

April 10, 20200 found this helpful

we bleached our green moss growing on our concrete steps, scrubbed well, rinsed, let dry well, then painted them white last fall. Today I'm looking at still green moss on side of steps eating away at the concrete causing it to fall off in chunks.


Any advise?

April 10, 20200 found this helpful

We bleached scrubbed dried and painted last fall this spring mold is back and eating away the concrete

April 25, 20200 found this helpful

Some concrete slabs are under decks and don't see much direct sunlight (parts don't see any direct sunlight) and algae forms. However I'm not sure painting would work as a long term fix.....

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February 25, 2017

How do I remove green mould from paved driveways? It is like a very thin layer on top of the pavers.


Silver Post Medal for All Time! 255 Posts
February 25, 20170 found this helpful

Are you sure it is green mold? Most molds are black. If it is mold, use bleach solution. But often if on the ground and green, its a fine moss.


If it is a moss, you would use a product like roundup.

February 26, 20172 found this helpful

I think it is probably algae. Algae is green and slimy and likes to grow on wet areas like mold. I would make a dilute vinegar solution and spray it on the pavers. The vinegar will also kill any weeds that want to grow in between the pavers.


Bronze Post Medal for All Time! 107 Posts
February 26, 20172 found this helpful

A great thing to use is a spray with half water, half white vinegar, and 20 drops tea tree oil. This mix will nix mold in all its forms. If you don't have the tea tree, that's OK.

February 26, 20170 found this helpful

When I have to remove green mold from my driveway, patio furniture, the siding of my home I use a pressure washer it works well with this issue. Makes my life so must easier.

March 12, 20172 found this helpful

White distilled vinegar would be my choice.

April 5, 20170 found this helpful

Pressure washers work by removing the top layer of whatever you are spraying. The trick is to keep the spray at lease 6 inches from the surface, and use a light touch! Keep the wand moving, do not stay in one spot. Also, you can use just plain water to spray with. You do not need fancy spray additives, they can add to the destruction if they contain caustic ingredients.

March 19, 20190 found this helpful

Be careful if you use a pressure washer on paving as it might blast the sand from the joints, leave a gap and then next year weeds will have a clear run. I use the bleach method and a stiff brush - it also beats a gym session!

November 16, 20191 found this helpful

Stop! RoundUp is a carcinogen and has devasted ecosystems for pollinators. Big agriculture uses it to kill all unwanted plant life (weeds), including important plants like milkweed, the ONLY host plant for the Monarch butterfly, now an endangered species. BAN ROUNDUP and use eco-friendly methods for getting rid of algae, moss, weeds, etc.

May 22, 20220 found this helpful

Roundup is a
Cancer causing poison. And when you use it you get in skin. And when on ground you drink it along with all of the filthy lawn fertilizers. #YUMMY

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May 16, 2012

What fast and simple way can I use to remove green algae from concrete steps? Thank you.

By Cindy S.


May 17, 20120 found this helpful

We use a power washer with a weak bleach concentration in the water - works great! If you don't have access to a power washer, you will need to get a good scrub brush and use a solution of 1 gallon water with 1 cup bleach added and just scrub it off - make sure to wear gloves, and to rinse off the steps afterwards.

February 11, 20190 found this helpful

Just sprinkle some washing machine powder over the steet when it's damp let in soak in when rains simly washes the algae away or jet wash the steet a couple days later definitely works

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ThriftyFun is one of the longest running frugal living communities on the Internet. These are archives of older discussions.

April 27, 2010

We have had a lot of rain these past 6 weeks in Connecticut. My front concrete steps are very green. Is this moss or is this algae? How do I get rid of it?

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