I did a test — see photo — plastic fence was moldy after several years, so I sprayed half the panels with this product (on the right) and sprayed with water as a control (on the left). After two weeks, the panels I had sprayed were quite clean, as you can see in the photo. (Photo was taken a few months later, in winter, of two panels.)
I have had similarly strikingly good results on the vinyl siding of my house.
Note, that along with mold there is often trapped dirt. This product kills the green mold, but a bit of dirt sometimes remains, so results do not always look perfect, but the mold is gone and seems to stay gone.
I have been very careful, as instructions say, not to spray on any plants, and to wear gloves, and not to breathe it in. When I researched this, I read that this is the same anti-mold chemical that hospitals use. And indeed, having worked in a hospital, this is what some of their chemicals smell like (not alcohol, a different smell.) Don’t use it if it will rain in a day or two; it must dry onto the surface you are cleaning. You can use it in cold weather, but not freezing cold.
The product came with a detached sprayer, so I found myself lugging the bottle in one hand and spraying with the other hand, which was perfect. I much prefer doing that rather than buying the version that attaches to your hose, which does not seem as precise a delivery mechanism.
Product also warns not to spray on anything that little kids will be playing on, or around, e.g. kids’ toys I suppose or jungle gyms that might get this on their hands and then into their mouths. I would also keep it away from any gardening areas, since molds and fungus can be an important contributor to soil fertility.
The reason I wanted to use this method rather than power washing is largely because power washing is known to force water in between the cracks of vinyl siding and mess up the interior of houses. I didn’t want to risk that. But, on the other hand, this certainly is a strong chemical.
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32 Fl Oz (Pack of 2)
$11.04 ($0.17/Fl Oz)
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$20.64 ($0.32/Fl Oz)
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From the manufacturer
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| BUY | BUY | BUY | BUY | BUY | |
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| Price | — | $20.64 | — | — | $38.80 |
| Application Method | None | Trigger Sprayer | Hose | Refill for Hose End + Refil | Refill for Hose End |
| Coverage | Covers 750 - 2,250 sq ft | Covers 60 - 180 sq ft | Covers up to 2,000 sq ft | Covers up to 4,000 sq ft | Covers up to 2,000 sq ft |
| Where to use | Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months | Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. | Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. | Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months | Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. |
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Delivery 1/2 empty spilled all over my wood floors
⚜️Mya Everett ⚜️
Reviews with images
AMAZING!
So, I am disabled and everything I end up using I have to research a lot before selecting a product. First, it has to be easy to use ~ can't be standing for more than 10 minutes to use (spinal cord injury), and can't handle for long (arthritis). I almost went with something else that was recommended to me that works within a few minutes, but you had to rinse it off. So that meant more physical work for me. Then I came across this. Spray it on, and in a week (maybe a few weeks if it's really bad), and it's gone. Sounded to good to be true, but I was game.I got this yesterday. Went out last night and sprayed it on the fence (all along the fence, front and back, but only took a picture of the corner to share if it worked). Before I could go out this morning to check we had a downpour that lasted for 3 hours. To say I was concerned was an under-statement, but it did dry long before then so I was hopeful.I waited until tonight to give it 24 hours before I checked, and low and behold I was shocked! Yes, there is a little bit still there, but it has significantly taken away the algae! Hopefully it will continue to fade, but if it doesn't, I'm fine with getting another bottle and going over the few areas that might remain.I HIGHLY recommend this! It might cost more to get the premixed bottle with sprayer, but I will be using this with the refill/concentrate for the foreseable future so worth it for me.(picture 1 is before, picture 2 is after)
Top reviews from the United States
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Reviewed in the United States on February 14, 2022
Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
I did a test — see photo — plastic fence was moldy after several years, so I sprayed half the panels with this product (on the right) and sprayed with water as a control (on the left). After two weeks, the panels I had sprayed were quite clean, as you can see in the photo. (Photo was taken a few months later, in winter, of two panels.)
I have had similarly strikingly good results on the vinyl siding of my house.
Note, that along with mold there is often trapped dirt. This product kills the green mold, but a bit of dirt sometimes remains, so results do not always look perfect, but the mold is gone and seems to stay gone.
I have been very careful, as instructions say, not to spray on any plants, and to wear gloves, and not to breathe it in. When I researched this, I read that this is the same anti-mold chemical that hospitals use. And indeed, having worked in a hospital, this is what some of their chemicals smell like (not alcohol, a different smell.) Don’t use it if it will rain in a day or two; it must dry onto the surface you are cleaning. You can use it in cold weather, but not freezing cold.
The product came with a detached sprayer, so I found myself lugging the bottle in one hand and spraying with the other hand, which was perfect. I much prefer doing that rather than buying the version that attaches to your hose, which does not seem as precise a delivery mechanism.
Product also warns not to spray on anything that little kids will be playing on, or around, e.g. kids’ toys I suppose or jungle gyms that might get this on their hands and then into their mouths. I would also keep it away from any gardening areas, since molds and fungus can be an important contributor to soil fertility.
The reason I wanted to use this method rather than power washing is largely because power washing is known to force water in between the cracks of vinyl siding and mess up the interior of houses. I didn’t want to risk that. But, on the other hand, this certainly is a strong chemical.
I have had similarly strikingly good results on the vinyl siding of my house.
Note, that along with mold there is often trapped dirt. This product kills the green mold, but a bit of dirt sometimes remains, so results do not always look perfect, but the mold is gone and seems to stay gone.
I have been very careful, as instructions say, not to spray on any plants, and to wear gloves, and not to breathe it in. When I researched this, I read that this is the same anti-mold chemical that hospitals use. And indeed, having worked in a hospital, this is what some of their chemicals smell like (not alcohol, a different smell.) Don’t use it if it will rain in a day or two; it must dry onto the surface you are cleaning. You can use it in cold weather, but not freezing cold.
The product came with a detached sprayer, so I found myself lugging the bottle in one hand and spraying with the other hand, which was perfect. I much prefer doing that rather than buying the version that attaches to your hose, which does not seem as precise a delivery mechanism.
Product also warns not to spray on anything that little kids will be playing on, or around, e.g. kids’ toys I suppose or jungle gyms that might get this on their hands and then into their mouths. I would also keep it away from any gardening areas, since molds and fungus can be an important contributor to soil fertility.
The reason I wanted to use this method rather than power washing is largely because power washing is known to force water in between the cracks of vinyl siding and mess up the interior of houses. I didn’t want to risk that. But, on the other hand, this certainly is a strong chemical.
Images in this review
Reviewed in the United States on November 10, 2023
Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
Reviewed in the United States on May 9, 2024
Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
Reviewed in the United States on June 25, 2022
Application. The product is designed to be generously spread over the effected area using the included pump handle. While this would probably be effective for spot treatments, any larger area requires you to repeatedly pull the spray pump handle and soak one spot at a time over the entire area you want to cover. This becomes repetitive and painful if trying to do in in one go. Maybe transferring it to your pump sprayer would make it easier, but they get a 1-star as is it set up now. The coverage also leaves a lot to be desired. I was able to treat only a few sidewalk sections and a small part of the porch during this test run.
Effectiveness. Half credit here. The product is designed to work its magic and then let rain and wind remove the remains for your cleanup. I sprayed on a Friday and the end of the next week we had our first wind/rain event. The mildewy green on the sidewalk sections did almost have most of their green topcoat cleared up in the first few days, but it was not 100% effective. The walk pictures here show the before and after shots and this was where it did the most good. The porch shots show the darker mold coverage that looking now it claims will take several months to remove. That's just not effective. Going out during the rain, I was able to foot scrub one of the darker spots that looks a little lighter in the after photo, but the rain poring on it was not cleaning it at all. So the Forget part of the spray and forget may work, but I can't have a product that takes months to finish. As for moss, the stonework around the flowerbed in the before and after shots show basically no effect whatsoever. The moss I test sprayed in the landscape timber shot does show some minor yellowing on one cluster, but the bulk of that piece and the remainder of the moss along it is still growing strong. Spraying the porch brickwork also yielded minimal results.
So, overall, if you have the light green algae/mildewy coating on a relatively non-porous sidewalk, this is probably a solution that would work for you as it was effective for that limited purpose. Anything tougher I would suggest you pass on this for something stronger.
Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
Minor Effectiveness, but Difficult Appliacation
Reviewed in the United States on June 25, 2022
We live in an area where the front yard gets a lot of shade and we are 'blessed' with algae, moss, mold, and mildew problems in those areas that need to be treated every now and then. A spray and forget product is the ideal solution for treatment vs anything that needs to have a scrubbing follow up. This seemed like it might do that from some of the reviews, but not so much.Reviewed in the United States on June 25, 2022
Application. The product is designed to be generously spread over the effected area using the included pump handle. While this would probably be effective for spot treatments, any larger area requires you to repeatedly pull the spray pump handle and soak one spot at a time over the entire area you want to cover. This becomes repetitive and painful if trying to do in in one go. Maybe transferring it to your pump sprayer would make it easier, but they get a 1-star as is it set up now. The coverage also leaves a lot to be desired. I was able to treat only a few sidewalk sections and a small part of the porch during this test run.
Effectiveness. Half credit here. The product is designed to work its magic and then let rain and wind remove the remains for your cleanup. I sprayed on a Friday and the end of the next week we had our first wind/rain event. The mildewy green on the sidewalk sections did almost have most of their green topcoat cleared up in the first few days, but it was not 100% effective. The walk pictures here show the before and after shots and this was where it did the most good. The porch shots show the darker mold coverage that looking now it claims will take several months to remove. That's just not effective. Going out during the rain, I was able to foot scrub one of the darker spots that looks a little lighter in the after photo, but the rain poring on it was not cleaning it at all. So the Forget part of the spray and forget may work, but I can't have a product that takes months to finish. As for moss, the stonework around the flowerbed in the before and after shots show basically no effect whatsoever. The moss I test sprayed in the landscape timber shot does show some minor yellowing on one cluster, but the bulk of that piece and the remainder of the moss along it is still growing strong. Spraying the porch brickwork also yielded minimal results.
So, overall, if you have the light green algae/mildewy coating on a relatively non-porous sidewalk, this is probably a solution that would work for you as it was effective for that limited purpose. Anything tougher I would suggest you pass on this for something stronger.
Images in this review
Top reviews from other countries
Dave D
pleasantly surprised how well it worked.
Reviewed in Singapore on October 25, 2023Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
Dave D
Reviewed in Singapore on October 25, 2023
Images in this review
Ben Lowe
No good.
Reviewed in Singapore on April 18, 2024Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
Wen Shan Wendy Chow
How long will the black stains disappear?
Reviewed in Singapore on August 19, 2021Size: 64 Fluid OuncesStyle: Ready to UsePattern Name: Outdoor RemoverVerified Purchase
Wen Shan Wendy Chow
Reviewed in Singapore on August 19, 2021
now (19th August 2021) there are some black stains left, I am not sure if those stains are dead algae, mold, or mildew, need to wait for a few months to see the effectiveness since the wall was sprayed 20 days only.
Images in this review
