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Old 09-08-2015, 06:06 AM   #1
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Dirty Roof

My roof on my RV is very dirty. I attempted to clean it using TSP and pressure washer, some scrubbing with a brush but it did not get clean. I am looking for suggestions on what I might try to get it clean enough to reseal.
Any advice would be appreciated.
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Old 09-08-2015, 06:22 AM   #2
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What type of roofing material do you have? I have used a garden sprayer with simple green and a stiff bristle brush with good results. Didn't use a pressure washer, just a hose. I love my pressure washer but feel it is too much to use around seams and caulk.
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Old 09-08-2015, 06:25 AM   #3
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Dawn and Mr. Clean Magic Eraser works pretty good...then a coat of Mop and Glow.
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Old 09-08-2015, 06:27 AM   #4
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In the spring and fall, I use dawn with a touch of bleach it always does a great job. I use a soft bristle brush which works well. Good luck on yours.
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Old 09-08-2015, 06:35 AM   #5
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A lot depends on what type roof you have. Mine is fiberglass and I use Wash Wax All Belly Wash with their scrubber when mine gets really bad (spring). Otherwise I use regular soap and water along with a soft bristle brush.
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Old 09-08-2015, 07:45 AM   #6
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Dirty Roof

My roof is EPDM Rubber on my motor home. I might add that because of my knees it is very difficult for me to climb so I tried washing by standing on a ladder and reaching with the brush. Some dirt came off but it still needs more cleaning.
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Old 09-08-2015, 11:33 AM   #7
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A good detergent, some bleach and a bristle brush should do the job. Regardless of roof material.
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Old 09-09-2015, 06:40 AM   #8
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Quote:
Originally Posted by Oldkarphart View Post
Dawn and Mr. Clean Magic Eraser works pretty good...then a coat of Mop and Glow.
I agree, only I would use a Mr. Clean Magic Eraser Mop. I'm too old to get on my hands & knees and use the Eraser. I have an EPDM roof, and a little Dawn with the mop does a great job.
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Old 09-09-2015, 07:05 AM   #9
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I understand about bad knees and if your cleaning from a ladder, it can be hard to get a good amount of leverage on the brush handle to really scrub the roof. Ive got a tip I think could really help you. Get yourself some "cycle wash". I stumbled across it as we race motorcycles and I have 5 gallon containers of this stuff on hand all the time. The same basic stuff is sold under several brand names. The easiest to find at most cycle shops would be either S100 (sold at most Harley dealers) or P liquid cycle wash at most other shops. You can also get on line from amazon for under 10 bucks and the 16 ounce would be enough to do the whole roof. They contain surfactants which literally lift the dirt and grime off with little or no scrubbing. Just follow the directions and rinse liberally. Its amazing stuff. If its safe enough to put on my Harley's paint, chrome and rubber its safe for a motorhome. I have washed the dirt bikes hundreds of times with it and it will not effect rubber, paint, anodizing chrome ect. Its better than simple green imo as simple green eventually dulls bare aluminum.
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Old 09-09-2015, 07:56 AM   #10
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Dirty Roof

mojoracing,
Thank you for the tip. I will get some of this cleaner and give it a try. Your suggestion sounds like it may work for me.
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Old 09-09-2015, 08:09 AM   #11
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Here is the correct information: https://www.dicorproducts.com/catalo...-roofing/#care

Before choosing a cleaner, pay attention to the caution on the web page.
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Old 09-09-2015, 11:10 AM   #12
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I've used the cycle wash on 2 rvs over a ten year period on both types of rubber and tpo roofs with no I'll effects. It will work great on fiberglass too
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Old 09-09-2015, 11:21 AM   #13
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I clean with Spic-n-span and a little bleach 2 times a year on my EPDM roof. I get up on roof, use a broom to lightly scrub it, then hose it off very well. 15 years and the EPDM is still white.
I don't think pressure washing EPDM is a good idea - due to moisture underneath and blasting off excessive roof material.
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Old 09-09-2015, 08:34 PM   #14
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As has been said, it depends upon the roof type. If fiberglass and otherwise in good shape, I would use a power wash and then Reject for waxing it. Obviously, use a wide nozzle.
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