Another rubber roof question

[montara24d]

Just came down from cleaning the rubber roof on the 5th wheel & wasn't happy with the results. I used a solution of water & simple green, & used a soft brush. The rig is stored on the north side of the house & is subject to mildew, the dark mildew stains remained after the cleaning. What are your thoughts regarding adding a splash of bleech, (1/4 cup per 3 gal. pail), or should I use another product. I'm a little shy about using a stiffer brush, as I scrubed the white right off the rubber on my last rig.
JOHN

[tvman44]

I have found no way to completely remove those stains.

[Skip426]

Quote:

Originally Posted by tvman44 I have found no way to completely remove those stains.

Ditto, MHO, a little staining would be prefered to appling something to the roof that could shorten it's life, by drying the material.

[Ray,IN]

Since Dicor warranties their EPDM material for 12 years with only a washing as you have done, I would never try to scrub it until it is as white as when new. This material is only .045 thousands of one inch thick on RV's.

[majorloser]

Since the material on your roof is EPDM, you might want to look at the compatibility chart:

Chemical Compatibility Database from Cole-Parmer

You will notice that sodium hypochlorite at a solution strength of <20% as in household bleach (6%), it only has a "B -Good" rating. It would easily withstand brief contact. But the real problem with bleach is that even when you hose it down it just becomes a diluted bleach solution. Something that would be even more harmful to all the other items on the trailer roof and down the outside walls.

If it was me and the stains were really bothering me, I'd try some household hydrogen peroxide. The chart shows that a 10% solution of H2O2 has a rating of "A-Excellent". The stuff you get in the drug store is only 3% solution. But the best part is when you hit H2O2 with water it converts to water or H2O.

Also works great on grout stains

[montara24d]

Thanks to all for the input. I guess the stains bother me more than they bother the roof. I think the answer to the problem is not to go up the ladder & look.
JOHN