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07-22-2015, 04:00 PM
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#1
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Senior Member
Rexhall Owners Group
Join Date: May 2011
Location: South Central Ohio
Posts: 458
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Roof Algae/ mildew/ mold ??
The weather has finally gotten nice ( read.. stopped raining ) here in southern Ohio. Today I decided to go up and do my annual on the fiberglass roof of the RV.
Normally car wash soap, and a long handled brush does the job and gets it 95 % clean. However today the roof was covered with small dark round spots, I scratched at one with a fingernail, and it looked green, so I am assuming algae. I tried a stronger cleanser, I tried a stiffer brush, nothing would touch the !$@#% spots. So as a last resort I got powdered Comet and a wire brush. Darn that's hard work. After 3-4 hrs I had to quit half done because I was afraid if I stayed up there any longer i wouldn't have the arm strength to get back down. Can anyone hazard an opinion on what these spots are ? Does anyone know of an easier way to remove them? I have a pressure washer which I use to clean my wood deck. I haven't used it on the RV roof in the past because the hose is relatively short, however, if it would get out these damn spots, I would be tempted to buy a longer hose.
Bob
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2003 Rexhall Rexair, 3550 Ford V10 with Banks
2014 Honda CRV-AWD via Blue Ox
Travel with SWMBO and Golden Doodle co pilot
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07-22-2015, 04:11 PM
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#2
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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I would be reluctant to use the pressure washer on the roof.
I wonder (NO I am not prepared to suggest this as I said I wonder)
Would adding a bit of bleach help? Any one know enough to answer?
I do not?
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Home is where I park it!
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07-22-2015, 04:26 PM
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#3
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Senior Member
Join Date: Aug 2014
Location: Pittsburgh, PA
Posts: 286
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This year it rained every day before yesterday and today. I cleaned my roof back in the first of June and it was just dirty so I scrubbed it with a brush and Simple Green which makes the job easy. Put the unit back into the garage and it looks good.
But I offered to clean up my friend's trailer that sits out all the time. It had mold and moss growing all over it from all the rain and no sunshine for 1.5 months. The roof had mold growing under the TV antenna and under the AC shrouds and the sides were covered with black streaks. The only method I found to clean it was to spray Kroil oil on it and rub it in with a cloth and then spray with L.A. Awesome cleaner and scrub it off. Did only a spot about 2 sq. feet at a time but it got clean. Took 2.5 days to get it all clean and looking new.
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Larry & Jean
2021 Jayco Melbourne Prestige 24RP
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07-22-2015, 07:27 PM
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#4
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Senior Member
Winnebago Owners Club
Join Date: Feb 2014
Posts: 962
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I live in Fl- I sprayed mine with a hydrogen peroxide solution-2 or 3 times
It works & I used it on the awning (applied solution with a wash mitt on a stick)
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07-22-2015, 07:43 PM
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#5
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,982
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Every 5G bucket of soapy water (car soap) gets 2-3 oz bleach too. I use an old long handled RV wash brush to scrub the roof. I've never had a problem with remaining mold or mildew after washing and rinsing. All the sides, awnings and covers are washed with the same solution.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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07-22-2015, 08:48 PM
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#6
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Senior Member
Tiffin Owners Club
Join Date: Feb 2011
Location: The Buckeye State
Posts: 609
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Bleach, that's what I use on the boat.
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Kent & Sue & Belle
2019 Allegro Bus 45OPP Lovin' it
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07-23-2015, 04:25 AM
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#7
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Jul 2012
Posts: 377
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I have used a combination of "car wash soap" in a bucket of water with a generous spray of Super Clean directly on the surface that I am scrubbing.
I use a 'soft' scrubbing brush on an extendable handle and scrub about 4 ft by 1/2 roof width at a time. (No longer kneel down and scrub...not necessary after the first time.
This has worked for me for years.
I scrub my fiberglass roof once/yr and hand wax after the cleaning.
So far, the roof is a clean bright white and only requires yearly maintenance.
I also use appx 30% bleach wash on the sides to keep the dreaded black spots away. Plenty or rinsing and the sides look like new and feel smooth. Next job is to wax .......
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2001 Winnebago Adventurer 32V, Ford F-53, V-10
2008 Jeep Grand Cherokee Limited, 4.7L V-8 QTII
U. S. Army Vet, In God We Trust
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07-23-2015, 06:17 AM
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#8
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Thanks Ray and others.. Now I know instead of wonder.. Sadly I'm not the O/P.
I had a trailer once that was parked for over a year under a pine tree. It was no longer anything approaching the factory shipped WHITE
I used bleach full strength. It was nice and white after that
Had a bit of moisture inside caused mold and mildew.. Took that out too Eliminated 100% but that puppy was not EDPM ruber, Bright Tech or anything other than fiberglass. So I had no qualms about bleadching it.
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Home is where I park it!
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07-23-2015, 06:47 AM
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#9
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Senior Member
Join Date: Jul 2010
Location: Conway, SC
Posts: 2,557
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Try a Mr. Clean Magic Eraser mop. My 15yr. old roof looks brand new.
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2000 Dutch Star Pusher
2009 Saturn Vue Towed
Full timed for 6yrs.
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07-23-2015, 07:24 AM
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#10
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Senior Member
Join Date: Nov 2014
Posts: 475
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I used Mold Armor on the exterior sides of mine to remove the layers of dark mold. Stuff works fantastic. Home Depot carries it. I also used the HD brand (cheaper) and it worked well also.
Home Armor
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2004 Country Coach Inspire Genoa
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07-23-2015, 07:30 AM
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#11
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Senior Member
Join Date: Jul 2010
Posts: 5,337
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I mix up a mixture of water, car washing soap, and bleach in a two gallon yard sprayer. I use about two cups of bleach. Spray it on my RUBBER roof and simply let it sit for a while. I then spray it off using an aggressive spray nozzle and rinse everything away with lots and lots of water. If there are stubborn spots, I will apply a second coat and use a SOFT brush. If after all that there is still spots, I leave them alone.
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Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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