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Old 08-22-2016, 04:04 AM   #1
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Best way to clean black mold off a roof

New to us 09 Tour....took a look at the fiberglass roof and lots of little black mold dots on it...so looking for best way to clean the roof and keep it that way.
Thanks for your advice...

2009 WGO Tour 40TD
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Old 08-22-2016, 04:30 AM   #2
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Depends on what your roof material is I have aluminum roof with fiberglass siding.
I used, http://d2ul0w83gls0j4.cloudfront.net...600/965375.jpg
goes on the end of garden hose spray on wait a few minutes then rinse and it works great.

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Old 08-22-2016, 08:41 AM   #3
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I do not want to put anything on my roof that I would not put on my paint, because you will get some run off, even if you have gutters. I don't know what some people use on thier roofs, but I've seen some awful run off staining, and it's more than just from roof oxidation.

I hate heights and really don't like being on the roof of the coach one bit...... The first time I thought I would use my automotive car wash and a pad on my extension handle, but it was just way too slick for my comfort..... I ended that session very quickly.........

New method is using several foam rubber pads I move around on, sit or kneel on one, then move the other 2 as needed to get around. When I did my first heavy scrub down of the roof on our coach about 8 months after we got it, I played Cinderella, took a bucket up on the roof with clean water, and a bottle that my wife makes up that contains baking soda and peroxide. I simply scrubbed down a small area at a time, then wiped it clean with a damp "rinse" cloth. Just work roughly a 2'x2' section at a time. Took about 3 or 4 hours, but came out very nice. (Required quite a few bucket rinse outs and fresh water refills).

Since then, I have just rinsed it off with water a couple times (standing at the back near the ladder on my pads, and just spraying it with a hose), and then recently did a hands and knees wipe down with a very diluted all natural cleaner, and it looks fine. I do need to clean up the dicor a bit when I decide to get serious on the roof again.

Another safety idea is to work with your slides and awing out........

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Old 08-22-2016, 09:22 AM   #4
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For good footing I wear those vibram 5 finger shoes. As for washing the tops I used a car wash and added just a capful of bleach to the 5 gallon bucket when full of soap water solution.
Those shoes really gripped that fiberglass roof. I felt more like I could tumble over being top heavy than slipping.
Helicopter pilots don't fly, they beat the wind into submission........
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Old 08-22-2016, 08:00 PM   #5
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Here is what I found that worked very well: http://www.irv2.com/forums/f104/roof-black-mold-and-algae-250830.html
And yes, you will have to wash the entire coach when finished with the roof.
Tim & Ruth
Alpine Coach 1999 40FDS, 350 ISC
Project Restoration
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Old 08-22-2016, 09:04 PM   #6
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Whatever RV we owned, I always added a few oz bleach to the 5G bucket of water+car wash soap. It always removed/killed all mold and mildew on the coach, its roof, and awnings. I usually wash the entire RV 4-5 X a year.
I always rinsed thoroughly after washing every 1--15' of roof or sides to prevent streaking or-well, bleaching of the paint or awnings.
DW never has noticed I'm using out of her laundry bleach bottle_.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"
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Old 08-23-2016, 12:22 AM   #7
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On mine I used scrubing bubbles cleaner with the wifes Velcro type mop head. Cleaned and rinsed and got the black spots off along with a lot of white powder.
I let dry and put 5 very thin coats of zep commercial floor wax. As I added layers it seemed to soak in. First coat looked blotchy but was all shinny by the 5th coat. Im on year 2 and the roof looks like the day I did it and I get no white steaks down the side when it rains.
The cleaning head was like a fine scotch brite and I used a cloth head for the wax.

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