Battling Algae, Mold and Mildew in Florida

Algae, Mold and Mildew Growth in Florida

Florida has more than its fair share of the humid, wet weather that results in stains from algae, mold and mildew. Recent years have even seen an increase of slimy orange, green, and black growth, or blooms. In fact, it's been so bad that 2013 was called the Toxic Summer from all the thick algae in the ocean coating the beaches and harmful algae blooms choking up waterways. As a homeowner, or a diligent renter, this means even more unsightly stains and slippery black surfaces around our homes.


ORANGE                           GREEN                           BLACK


Using 30 SECONDS Outdoor Cleaner

The good news is 30 SECONDS Cleaners are available in retail stores across the state (and online) to help make outdoor cleaning as easy as 1, 2, 3!

  1. Spray on 30 SECONDS Outdoor Cleaner or Outdoor Multi Surface
  2. Let set for the time indicated on the bottle for your surface, brush if needed for heavy staining
  3. Hose off! No pressure washing needed

 In no time at all, your outdoor surfaces will be as clean as new.

Cleaning Florida Surfaces

Florida customers have been delighted to find out how well 30 SECONDS Outdoor Cleaner works on their lanai, patio, fence, and porch. Some have even been kind enough to share their before and after pictures with us. Well, they say a picture is worth a thousand words, so check these out! 

Customer Review

"My husband and I bought 30 Seconds Cleaner at Home Depot for the first time today.  I was skeptical.  We have tried many products to clean our white PVC fence, but we always end up having to drag out the pressure washer and scrub.  Every time we do this, about every six months, we end up spending an additional $50 in water during that month.  My husband went outside to test it, and I waited, not expecting much.  Not long after he went out, he came back into the house insisting I come out to take a look.  I still did not believe him.  I was AMAZED at the results!  In the short time he had been outside, he had cleaned several large sections of fence.  It looked like new!  Then he showed me how easy it was.  He sprayed another section, and right before my eyes, the green mold and slime seemed to melt away.  It was a miracle!  I have never been so pleased with a new product.  So much so, I had to share the results with you, and take the time to thank you for creating this product.  I will never have to pressure wash the fence again.  This will save us time, and some back breaking work.  I have attached  a before and after picture, as well as a video link.  Please feel free to use it to show the effectiveness of your product."

- Jessica C. 

Before and After Pictures

Customer Photos

Tag #30SECONDSCleaners on Instagram or Twitter. @30SECONDSCleanerUSA on Facebook


Jamie Roussel

June 30, 2017

Is your product safe to use on the screens we have in Florida around our pools?

Jessica Merly

June 30, 2017

Great Questions, Jamie! Yes, 30 SECONDS is safe to use on the screens and lanais surrounding pool areas. We always recommend you test first when cleaning a new surface. Apply the cleaner, wait 5 minutes, and rinse to see what results to expect. Make sure you rinse well if there is any exposed metal. Feel free to reach out to us directly if you have more questions, 503-669-1953. Cheers!

Don Weso

July 10, 2017

We own a rental property which had a plumbing leak (Small leak, but went undetected for about a year).A plumbing company repaired the leak, but warned that the ceramic tile wall would need to be removed in order to remove/take out the black mold. Do you have a product which could be administered through the top of the wall ABOVE the mold where the wall is sheetrock (gypsum board), so as to not disturb the ceramic tile. Thank you. Don Weso

Jessica Merly

July 11, 2017

Thank you for your question, Dan. Our products are outdoor cleaners and are not the best options for treating black mold in walls. We would recommend you try and talk to a contractor who specializes in properly removing black mold. Good luck with your project.

Harriet Williams

October 17, 2017

Is 30 Seconds Outdoor Cleaner harmful to fish and wildlife? I live on the water.

Jessica Merly

October 19, 2017

We are glad you asked, Harriet!
30 SECONDS Cleaner breaks down readily in the soil. However, it should be kept out of waterways. If you have to rinse into the water, then we wouldn’t recommend using our product. Thank you for double checking.

Anthony C

November 12, 2017

Do you recommend your product on travertine pavers on a lanai around a pool?

Jessica Merly

November 13, 2017

Hello Anthony,
30 SECONDS Outdoor Cleaner is made to be safe on most all outdoor surfaces, including travertine pavers. However, we always suggest testing in a small, inconspicuous area first when using it on a new surface. Simply apply a few drops, let sit about 5 minutes, and rinse to see results.
For the pool, rinse as much of the product away from the pool as you can and double check pH levels before swimming.
Thank you for your question.

Joe mazzola

June 15, 2018

I noticed small black spots on my front steps , i tried using dawn dishwashing on a small area with a brush and it didnt work .I brought 30 second cleaner in lowes mixed it 50 50 in my sprayer and i couldn’t believe my eyes as to how well it worked. great product. Very satisfied

Janet egan

June 18, 2018

I have a newly painted picket fence all different colors will this remove the paint as the bleach did🙁

Jessica Merly

June 18, 2018

Hello Janet,
We do strongly recommend testing when cleaning a new surface for the first time, especially if a surface is susceptible to dulling or bleaching effects. Red and purple paints can be particularly finicky, and you should test any cleaner that you use on those colors every time you clean. You’re welcome to give us a call if you’d like to discuss your project, 503-669-1953. Cheers!

Kay C

July 24, 2018

I have a pavered walkway. Is this safe to use on pavers and will it hurt the plants along the walkway?


July 25, 2018

Hello, does your product contain bleach? Can it be used on travertine deck tiles?
Thank you.

Jessica Merly

July 24, 2018

Hi Kay,

We do recommend testing 30 SECONDS Outdoor Cleaner when cleaning a new surface for the first time. Depending on the age and type of stone, efflorescence can occur with many types of cleaners, so testing is always best.
30 SECONDS Outdoor Cleaner is safe to use around your lawn and landscaping, so the plants around your pavers will be just fine. If you spray directly on to the foliage, just give it a quick rinse within 10 minutes to prevent sun spots. Happy Cleaning!

Jessica Merly

July 26, 2018

Hello Natasha,
30 SECONDS Outdoor Cleaner does not contain regular household bleach. Our Outdoor Cleaner is our proprietary Industrial Sodium Hypochlorite which works in conjunction with the powdered soaps that let our product get deep into the surface to root out and remove the stains from Algae, Mold and Mildew.
We do always recommend testing a small section when cleaning a new surface for the first time, including your travertine tiles. Apply a few drops to an inconspicuous area, let sit about 5 minutes, and rinse to see results.

Jess Stout

August 06, 2018

Can the 30 second cleaner be use to remove mildew from painted aluminum panels inside of a sunroom? Does it harm aluminum? Thanks.

Matt Frost

September 04, 2018

We had a new pool/lanai enclosure installed after Hurricane Irma. Because of construction delays, the structure was spread out around our yard for about six weeks prior to being installed. Our irrigation system runs off a well, and the well water left white stains all over the bronze (painted aluminum) cage. I have no idea whether it’s from calcium or other deposits, but I haven’t found an easy way to remove the spots and stains. Would you’re product be effective on SW Florida well water stains? I do not believe they are rust related. Thanks for any input or suggestions.

Jessica Merly

September 04, 2018

Hello Matt,
Thank you for considering 30 SECONDS Outdoor Cleaner. Our cleaner is made to work against organic stains, such as those from Algae, Mold and Mildew or Dirt and Grime. Unfortunately it will not get you the results you’re wanting against hard water stains or mineral deposits. Also, you may want to be careful which product you chose as bronze can be sensitive to some types of cleaners. We would recommend you contact a trusted contractor or home renovation specialist to see what products they have tested and recommended for your cleaning project.
Sorry we couldn’t be of further assistance. Best of luck with your project.

David Cruice

September 05, 2018

Good morning, Jessica. Which product would you recommend for (1) cleaning a shingle roof (low pitch that I can walk on) and (2) a brick paver driveway? I’m wondering whether to use the 30 Second Outdoor Cleaner or Spray and Walk Away product. I’d like quick results but, at the same time, I’d like a long-lasting sealant to keep the mold/mildew away. Thx.

Jessica Merly

September 05, 2018

Hello David,
30 SECONDS Outdoor Cleaner can be used safely and effectively on both shingle roofs as well as driveways. This is an instant clean, but once rinsed away its work is done.
Many of our fans love to apply the Spray & Walk Away a day or so later. This way they get the instant clean of the Outdoor Cleaner, and the overtime treatment of the Spray & Walk Away. Depending on the growth in your area, consider re-treating with Spray & Walk Away annually to prevent the return of Lichen, Moss, Mold and Algae.
We hope that helps. Feel free to contact us for further questions. You can reply here or call 503-669-1953. Cheers!


September 18, 2018

Does 20 SECONDS Outdoor Cleaner get rid of the blackened concrete sidewalks (presumably from acid rain??)? Can it be used on tiny black spots on a texturized indoor bathroom ceiling? Can it clean lichen off a brick outdoor windowsill? Thanks!

Jessica Merly

September 18, 2018

Hello Jane,
Great questions! 30 SECONDS Outdoor Cleaner will help clean stains from Algae, Mold and Mildew from your outdoor surfaces. Acid rain stains require a cleaner that will work on mineral build up.
We do only recommend out cleaner for Outdoor use.
For Lichen, we would recommend our Spray & Walk Away. Click on Products on the top of the screen to learn more.

Jack Peterson

December 31, 2018

I’m in central Florida, and my asphalt shingle roof has become discolored over time. I’d like to use Spray and Walk Away, but I’d like to see results in a few weeks, not six months, as the video shows in each example. Do I need to use 30 Seconds Outdoor Cleaner to see results in 2-3 weeks? There’s no moss, just algae/mildew.

One additional question: are both products safe to use in basic sprayers, and can those sprayers then be used for other tasks after being rinsed?


Jessica Merly

December 31, 2018

Hello Jack,
30 SECOND Outdoor Cleaner is a fast acting, instant clean that you rinse away and see immediate results. Spray & Walk Away is an overtime treatment that will take 4-6 weeks to see results. We think the Outdoor Cleaner may be better for you since you’re wanting faster results.
As for sprayers, there a quite a few on the market all rated for different types of application. While plenty are compatible with our products, you’ll need to check the sprayer itself for its intended use. We also offer our own sprayer which is safe to use with all of our cleaners. Assuming compatibility, yes you should be able to rinse out the sprayer and then use for different projects in the future.
Please feel free to give us a call at 503-669-1953 to discuss your project in detail and make the best choice of cleaner and sprayer for your needs. Cheers!

William White

January 09, 2019

I’m in the industry and 30 SECOND Outdoor Cleaner works really well and very quickly. I use it at home all the time!

Jessica Merly

January 09, 2019

Hello William,
Now that is quite the endorsement! When we can impress someone who works in the mold removal business enough to trust us at home, you know you’re doing something right!


February 08, 2019

This was really a good article. there are things that I can use for future reference

John Oppenheimer

February 18, 2019

Hi. Just noticed some mold on underside of outdoor exhaust hood over the grill. It is stainless steel. Can I use 30 Second Outdoor Cleaner on stainless?
Thank you.

Jessica Merly

February 18, 2019

Hello John,

Thank you for contacting us about cleaning Stainless Steel with 30 SECONDS Outdoor Cleaner. Stainless steel can vary in hardiness and different finishes have different cleaning requirements. For your outdoor exhaust hood, we would recommend that you contact the manufacturer and see what they recommend you use

airbnb clean

March 15, 2019

Thanks for sharing this article.

Rebecca H Pittard

April 29, 2019

Is it safe to use 30 seconds outdoor cleaner on a stone patio?

Jessica Merly

April 29, 2019

Hello Rebecca,
30 SECONDS Outdoor Cleaner is made to be safe on most all outdoor surfaces including patio stone. We do always recommend testing in a small, inconspicuous area first. Spray a small amount of cleaner, let sit 5 minutes, and rinse to see results.


June 18, 2019

I use this product all the time. And I love it! However, I need to wash the surface first this time. Does it have to be dry before I can use the 30 second cleaner?


June 18, 2019

Those were some amazing information. Thi helps me so much to understand some useful thing.

Jessica Merly

June 18, 2019

Hello Patty,
Thank you for your question. Yes, 30 SECONDS Outdoor Cleaner should always be applied to a dry surface.

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