Rated 3.5 out of 5 by 4
Rated 4.0 out of 5.0 by Eldo CORRECTION to my previous review...
I made an error in my earlier review when I recommended against using other hose-end garden sprayers. I discovered this when I went to spray 2 more roof sections and the Moss Out sprayer died on the third use...
It was late in the day and I wanted to avoid a trip across town, as well as spending another $16, so I dug out an old Ortho/Hayes metal hose-end sprayer and poured the remaining Moss Out into it. Turns out that it sucked up the chemical just about as fast as the dead plastic Moss Out sprayer AND left the telltale white foam when it hit the shingles.
Obviously it's hard to find good metal sprayers today, but I had to correct my previous misdirection and instead recommend that anyone who already owns a functional hose-end sprayer try buying the 54-ounce refill first; you may be able to skip the overpriced 27-ounce sprayer entirely...
April 27, 2016
Rated 4.0 out of 5.0 by Eldo Works fine for me...
I didn't monitor it by the day or week, but it definitely worked here in NW Oregon.
I applied it to the roof on the side of the house that had green moss growing along the vertical edges at the bottom of each row of composite shingles in November or December. Spraying up from the deck I could reach a little over 3/4 of the roof, leaving a circular arc at the end of the treated area. Now in March, I looked at it and that dividing arc is very pronounced; the moss to the left is dull gray and hasn't grown while the untreated area to the right is nice & green and is almost twice as large as before!
I wish it was a bit cheaper, but now that I have the sprayer bottle I'm going to buy the refill that has 100% more product for only 30% more money. (Don't try to skimp on the sprayer with an Ortho garden sprayer or some such - this mixes a much higher ratio than the Ortho.)
March 21, 2016
Rated 1.0 out of 5.0 by JonnyB Didn't Make A Difference
We bought this product after buying a gallon of bleach to rid our roof of the ugly and damaging moss. We thought we would try this first thinking that it was called MOSS OUT it should be the best thing you could use to remove moss, right? Wrong! I took the time to carefully read the directions, mix it properly, then spend the better part of 6 hours spraying down our roof. The bottle says "See results in HOURS!" We didn't even see results in weeks...what a waste of $40 and a good chunk of my day off. The moss on our roof isn't even that bad compared to others in the area and this made not even a little difference. In the end Home Depot did refund our money but stick to bleach! It's far cheaper and works the very first time.
November 15, 2014
Rated 5.0 out of 5.0 by Tazman37 Great product
I bought this product to kill the moss on our roof.After spending countless hours pressure washing the moss off of the roof,I questioned myself as to there being an easier way.I went to home depot and purchased this product,used it and it sure made moss removal a whole bunch easier.
August 1, 2010