Below is the information from Dicor that rlwhit received. Enjoy!
CLEANING MOLD AND/OR MILDEW FROM RUBBER ROOFING
MATERIALS NEEDED:
- BUCKET OF WATER
- SPONGE
- MEDIUM BRISTLE BRUSH
- TILEX BATHROOM CLEANER (MOLD/MILDEW)
TILEX BATHROOM CLEANER (MOLD/MILDEW)
There are no ingredients in EPDM rubber roofing that will promote the growth of mold and/or mildew. Atmospheric dirt, shade, sun, humidity and moisture are some of the contributing factors that form mold and/or mildew. Regular cleaning of your rubber roof will help prevent mold/mildew from forming on the EPDM roof. Dicor recommends that you wash your roof an average of 3-4 times a year using a non-abrasive cleaner (Dicor Rubber Roof Cleaner RP-RC160C concentrate or RP-RC320S ready-to-use) and a medium plastic or nylon brush.
Mold/mildew on your EPDM roof is simply a parasite that attaches itself to the roof and grows – similar to bathroom mold that grows in your shower. It does NOT attach the membrane but is unsightly and if allowed to grow will discolor the roof completely and may become a stain that cannot be removed.
Please note the removal of mold and/or mildew is not a job to be rushed. Allow ample time to complete the job and follow the instructions carefully. Although the products mentioned will not harm your roof, if you do not follow the instructions, other areas could be affected.
Tilex is a bathroom cleaner that can be purchased at many grocery stores or discount stores. Tilex contains strong chemicals. Please read the label thoroughly. Tilex should not come in contact with painted or aluminum surfaces. If it drips over the sidewalls or comes in contact with painted or aluminum surfaces, wipe immediately with a damp sponge.
WORK WITH A SMALL AREA in order to maintain the control. Spray a small area approximately 2’ x 2’ with the Tilex. Allow the Tilex to remain on the roof for 3-10 minutes per area. Scrub with a medium bristle brush. After scrubbing, wipe with a damp sponge.
When finished with whatever time frame you intend to spend on the roof (whether you do the entire roof or just a portion)
rinse the roof thoroughly with a garden hose.
BE SURE TO RINSE WINDOWS AND SIDEWALLS ALSO.
Most often one application is all that is needed to alleviate the problem. Depending on the amount of mold and/or mildew and the length of time growing, more than one application may be necessary.
Follow this procedure with the Dicor Roof Gard (RP-RG320S) protectant.