In addition to my slide seals question- Roof question

If you have an Alpha Ply TPO roof, like my newer Jayco, this is what they say...
The link to cleaning instructions is down, but they clearly state

Proper care and maintenance of the Alpha Systems Superflex roof membrane is critical to sustain years of trouble-free performance. Normal maintenance is simple, easy and requires no special materials. Periodic cleaning (three to four times per year) is the primary maintenance required.

That is posted at the bottom of this page, from the MANUFACTURER... http://www.alphasystemsinc.com/Product/ProductList/1