Ranger Smith wrote:
They say comet and spic and span is OK. They say stay away from any cleaner that has petroleum distillates and citrus
From RV site
Regardless of the type of rubber roof you have, NEVER use any cleaners or conditioners that contain petroleum solvents, harsh abrasives or citrus ingredients. These types of cleaners can cause permanent damage to rubber and vinyl surface. Rubber roofs already have built-in ozone and UV protectors, and cleaning a rubber roof is quite simple. You can use household cleaners like Comet and Spic And Span or Dawn dishwashing liquid for most routine cleaning needs
Spoke AT LENGTH to a Dicor rep at the recent CW/GS Rally in Syracuse about this topic. He told me exactly the same thing - stay away from ANY cleaner with petroleum, citrus, or abrasives. Many companies make "RV Roof Cleaner", but as he put it, "it's just soap". He did mention both Spic 'n Span and 409 as good cleaners, though, in-spite of the fact that Dicor has their own cleaner, which he was selling!
What DID say was important was the quality of the protective coat that you put on AFTER you clean! That's where the REAL protection comes from. He really was down on the "combination" cleaner/sealant products. How much protection is left behind with a product that you rinse off?