Model # DR1G

Internet #100196451

Store SKU #497480

M-1 1 gal. Deck and Roof Cleaner


1 gal. Deck and Roof Cleaner

  • Designed for heavy cleaning of decks of many wood types
  • Restores the original color to your wood
  • Cleans and whitens concrete, vinyl siding, and fiberglass

Frequently Bought Together

Product Overview

The M-1 Deck & Roof Multi-Purpose Cleaner is designed to clean the dirtiest pine, cedar, redwood, cypress and birch decks or siding. It is also effective on asphalt shingle or cedar shake roofs, and badly stained or oil spotted concrete in the fastest and easiest way possible. This cleaner also works fast at removing dirt, grease, tree stains, baked-on pollen, mildew and algae stains, and weathering. It restores original color to your wood and makes asphalt and cedar shake shingle roofs look new! It cleans and whitens concrete, vinyl siding and fiberglass. This product is a concentrate that dilutes 9:1 with water, making 10 gal. and will clean about 2,000 sq. ft. It is water based, NON-TOXIC, biodegradable and contains no solvents, phosphates or bleach. Being free of bleach, it will not harm shingles or bleach wood.

  • Easy to spray on and wash off
  • Will not harm grass or shrubs
  • Safe to use on wood or shingles
  • Removes 15 years of weathering

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

How long before seeing results

Asked by: Jk
It has to dry.
Answered by: Shaun
Date published: 2017-05-29

applying with a power washer

What is the correct dilution if i am hooking it up to a power washer, as the power washer itself will provide for a dilution during application?
Asked by: diyer
I used a separate spray bottle (went heavy on the concentration) and sprayed my GAF 30-year asphalt shingle roof, waited about 15 minutes, then (light-setting) hit it all with my pressure washer. Worked fine. Got years of nasty mold and mildew out of the roof, restored it to "like new" condition. I discerned minimal "shingle skin" loss.
Answered by: Shopshark
Date published: 2017-05-23

Will M-1 clean Composite Decking?

Will M-1 clean Composite Decking?
Asked by: pete
Yes, this can be used on composite decking material.
Answered by: CommunityAnswer
Date published: 2017-05-28

Does anyone have any experience with using this product on asphalt shingles? I have not had much luck on shingles.

Just rinsed with water, did not want to use pressure washer on shingles. Will it work with pressure washer?
Asked by: Jeb58
See my 5-star review. It worked very nicely with my GAF asphalt roof -- but sure, I had to use a (light setting) pressure washer after letting this stuff soak in for about 15 minutes. You can also hover over each shingle with a garden hose (nozzle spraying), but that takes longer than the wide-spray headed pressure washer that I used. Either way, I did not perceive that I suffered all that much extra "wear" expense to the shingles by pressure washing. It was very satisfying to see all the nasty black and green and copper "ick" wash out of my shingles and onto my driveway. This product is one of many that I tested, and it worked the best (best price, too).
Answered by: Shopshark
Date published: 2016-12-17
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Customer Reviews

1 gal. Deck and Roof Cleaner is rated 3.9 out of 5 by 27.
Rated 4 out of 5 by from I'm a bit surprised by the disparity of reviews here. I'm happy with the product, which is basica... I'm a bit surprised by the disparity of reviews here. I'm happy with the product, which is basically soap and lye. I used it on my redwood deck. I diluted it 9:1 as per directions and sprayed it on. Left it there around 10 minutes ,then brushed, then hosed off. I did not use a power-washer. It brightened the wood (which you don't see until it's dry, at least with redwood). It did roughen the surface, with bits of wood sticking up. It took off a bit of oxidized wood- you can see the color of the water when you hose it off. It takes a lot of hosing to get it all off because soap is hard to completely wash off. You'll see that it's still a little foamy and that could make the surface slippery. I'd suggest using it the day before a rain so you can get extra rinsing done by the rain. I have some painted wood around my house that was dirty and mildewy. It did a very good job cleaning that off too. It does a decent job getting rid of mildew but if your problem is only mildew you're probably better off with bleach. I guess it's possible that different wood has different issues and maybe even different types of mildew. Brushing helps but note that if you brush against the grain you're going to roughen up the wood.
Date published: 2017-05-29
Rated 5 out of 5 by from Ready for Staining Without Much Effort Easy and effective without much effort. Spray on, brush in, and power wash with a Home Depot power wash and your deck is ready for staining. This product took off over 10 years of dirt and grime. Wear protection as the chemicals are strong and irritating on the respiratory system.
Date published: 2015-06-11
Rated 5 out of 5 by from This works well but requires some effort Friends, I'm sharing my test results of different roof-stain removal efforts and products, including this one, which I now recommend because it works and is worth ten bucks. Some Background: I have a 12-year old, grey colored, GAF 30-year asphalt roof that I let go too long re: black mold, blended with copper-colored and green-algae stains. Some areas have all three, others just black mold, or that strange copper tone that weirdly glistens in direct sun. I first tried a pool-shock based, DIY mixture. I mixed a cup of powdered pool shock with 1-gal of water and spayed it on my roof. I waited 10 minutes and then re-sprayed that same area with this stuff: 20 minutes later, I garden-hose-sprayed the treated area off. Some green and black mold was removed, but plenty of staining remained. A repeat treatment did little better. I lost patience. So I went back to Home Depot to try "M-1 Roof and Deck Cleaner": It said mix 13 oz in a gallon of water and spray it on. I probably used 20 oz. because, well hey, my stains were really dark. I sprayed the mixture using a $16 hand-pump sprayer, something like this: I came back in about 15-20 minutes and still there was no change -- UNTIL I sprayed, close-up (4” away) each shingle with my garden hose (narrowly focused spray using a standard nozzle). I didn’t want to use my pressure washer, it was too much of a hassle to get it out of the garage. It worked! All the dark mold and gunk was stripped out of each shingle. Mind you, I had to work some. I had to methodically spray each shingle up close, so that’s a lot of back-and-forth, tiring my arm. To be clear: You must stand over a patch of roof and bend over and direct-spray each shingle, from about 3-4" away, at full blast (guessing my hose was outputting at 200-300 psi or so). Yes, you’ll get wet. But all the gunk came out of each shingle, and it was satisfying to see my roof shingles restored to what they once were. And honestly, the mold I had looked like it would never come out. So, I was impressed by M-1, and pleased at the price ($10 bucks a gallon). Bottom line: From spray on to spray-off, it takes about a half hour for each 60 square feet of affected roof. I had about 180 square feet of afflicted roof area. Of course, you need to do this when the sun is brightly shining on your roof so you can see the dark mold shingles from the wet ones. I suppose the job would go faster with a pressure washer and wide enough spray head. But I was worried I'd use too much pressure and prematurely wear out my shingles. A garden hose, with standard output, will do the trick. It just takes longer. I also invested in a (more expensive) "Spray & Forget" solution: That product is designed for the lazy. You spray, then walk away. No immediate results, though. It says it takes weeks if not months to work (relies on rainfall). I don’t know if that’s true (just tried it today), but after I finished my “M-1” job, I sprayed the just-cleaned area with it. I figure it's a good way to prevent recurrence of the mold and algae that constantly afflicts my Savannah, GA roof (Savannah is a high-humidity environment and thus one is constantly battling mold and other forms of "ick" on one's home).
Date published: 2016-01-25
Rated 4 out of 5 by from Worked as advertised Applied it on my deck through my power washer on low spray level. Used a stiff brush with light pressure to work it in a little better. Let sit for about 10-15 minutes, making sure it didn't dry by lightly spraying every 5 minutes, and power washed it off at medium to high pressure. Deck wood looks almost new. Removed all the mildew, dirt, and grease spillage from my BBQ grill. Deck is about 15 yrs. old and hadn't been cleaned in 3-4 years. Even loosened up the old peeling stain to help removal with power washer. Good product...worked as advertised.
Date published: 2014-06-27
Rated 3 out of 5 by from No bleach or acids -- but it does have lye! This particular solution remains mostly unused, thanks to the chemistry that I discovered after reading the MSDS. I was planning to use it on my roof to remove the staining, but I decided against it. A test spot showed that it indeed removed the staining, but I decided not to go much further, and used a solution of bleach and Jo-max instead. Many deck cleaners have oxalic acid (a weak acid), and many mildew removers require the use of bleach. I find it funny that this material boasts of not containing acid or bleach, when it does contain a 14% concentration of NaOH, sodium hydroxide (lye, drain cleaner.) NaOH is a strong base, so this is correct that there is no acid or bleach, but NaOH is, in my mind, more dangerous than oxalic acid or bleach. Aluminum and NaOH are a famously bad combination. Now, if your aluminum capping is painted, and you rinse this solution quickly, there will be no problem. But I didn't want to risk it around the gutters, capping, and other aluminum siding on the house. So for decks, I can't see any harm, but for roofs, I do wonder about the wisdom of washing aluminum trim with this solution. If nothing else, the chemistry should be advertised/warned about more prominently.
Date published: 2015-10-12
Rated 5 out of 5 by from Exceeded my expectations I replaced my roof shingles 5 years ago with a light tan color and oak trees hanging over the house had resulted in "tree scum". I was hesitant about harming the new shingles but used M-1 as directed and rather than using a pressure washer, I used a high pressure nozzle on a water hose to rinse. The result is that the affected shingles now look new like the rest of the roof. Azaleas planted directly in the roof drip line were not harmed in the process and I did not cover them. I highly recommend this product.
Date published: 2013-05-09
Rated 5 out of 5 by from works great i have been using this product for more than ten years now.i found that if you are cleaning your deck its best to do it on a rainy day,because the deck needs to stay wet the whole time. mix it 9 to 1,and spray it several times and just keep it soaked with the cleaner and a wet surface for an houre and rinse ,when the sun dries it out it will be cleaner,clean enough to stain.never p.w. a deck it will ruin the wood.
Date published: 2013-03-16
Rated 5 out of 5 by from Great Stuff! Don't waste your money on anything else! I used in on a deck and roof shingles and the dirt and crud came right off. Anything else I've tried didn't work as well as this stuff. It doesn't have a bad smell at all, and it needs only 10 minutes to work. My deck is small, so I have probably enough left to last me for 10 yrs.
Date published: 2012-06-11
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