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Old 06-14-2012, 06:24 PM   #7
Festus2
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Join Date: Mar 2009
Location: Fraser Valley BC Canada
Posts: 7,015
Hank -
I've Googled Dawn looking for any sign of the words "petroleum distillates" in the literature as to what Dawn contains. All I've seen in the ingredients/contents are numerous chemicals and other products but no mention of anything to do with petroleum distillates or citrus-based products -- another no-no for EPDM roofs.

Dicor recommends a non-abrasive cleaner such as RC 100TM, Borax, or Dawn TM was another statement coming from the Dicor website.
It seems that petroleum distillates somehow react with the EPDM rubber which may cause it to "lift" and possibly form bubbles since the rubber and the adhesive no longer form a proper bond. I wasn't a chemistry major so I have no idea what really takes place.

Not sure if that sheds any light on your concern .........
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