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How to Make the Roof Cleaner used in the Video

Cleaning A roof

A little background on how I started Roof Sparkle. A company that’s  making cleaning products asked me if I could make a video for some of their cleaning products. Now I won’t go into details on who they are but they had a roof cleaner that involved the use a power washer. Big red flag in my eyes. Being a contractor for years, I knew right off the bat that was a big no-no.

So the next question I asked myself what’s that black stuff on the roof. Well, it’s mold. And what kills mold, bleach right. Well, as true as that is bleach is only made up of 5-6% Sodium Hypocrite. And that’s great for your whites and around the house but not on your roof.

For the roof, you will need something a lot more powerful. Some of you may know it as pool shock. This is made up of 12% by weight “Sodium Hypochlorite”. But because it’s as thin as water it will run right off the roof and not really have the time (five minutes) to do its job. So we have to thicken up a bit. The best way, add some liquid dish soap to the mix to help the SH stick to the roof for more than one second. You can go into any pool supply and ask for a gallon of shock, for about $4.00 per gallon. This is just a heavy-duty version of household bleach. And no Walmart does not sell this or the big box stores. This method will remove algae from a roof.

How to remove those ugly black stains on a roof with Roof Sparkle
Watch this video on YouTube.
Doing my best to bring you the best videos I know how.

Now, of course, we buy it from the manufacturer and by the truckloads at a time.

Applying It

When we started we used a regular bug sprayer. Use a three gallon pump sprayer, use one gallon of SH and two gallons of water (H2O) add about 4 oz. of liquid dish soap and spray from the roof top working your way down.


  • clean your roof when it super hot out in the baking sun. It will kill the SH and dry before it’s clean.
  • Don’t touch the SH with bare hands. Wear gloves and eye protection.
  • Don’t spray your roof down first with water to cool it off.
Dirt Roof

Dirty Roof

Clean Roof

Clean Roof







Roof Cleaning Products The I Recommend

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I apologize that I hadn’t seen the actual mix stated in the big blue box – lol. That says to use one gallon of SH and two gallons of water (H2O) add about 4 oz. of liquid dish soap spraying from the roof top working down. In your reply you mention that “a cup is plenty on the above mix” which I’m assuming is the mix stated in the big blue box. So to 1 gallon of SH + 2 gallons of water, do I add 4 oz or 1 cup of liquid dish soap? Also, might you have any… Read more »


You mention mixing the sodium hypocrite with some liquid dish soap to thicken it up a bit. Do you have a recommendation regarding what dish soap and are you referring to regular dishwashing liquid or dishwasher gel? Also, what is the mixture ratio of sodium hypocrite to dish soap?


I finally found the SH 12.5, but I’m TERRIFIED to get on the roof! So I thought I would get a hose-end sprayer? Now I cannot figure the calculations to keep the mixture ratio correct? The biggest I could find was a 36 oz. any ideas on how to do this, or not possible?


BTW stick with straight sodium hypochlorite and avoid the calcium formulations. They leave a white residue.


My situation was complicated by having a slate roof I couldn’t walk on. I climbed a ladder to the eaves and used a $15 WalMart SuperSoaker filled with 10% pool shock and the algae was gone
immediately. Yeah I know…it’s a bit hinky but if anyone can figure out a better way I’d love to hear it.