Direct from Glen Raven Mills (Maker of Sunbrella) web site:
"Always use a mild soap i.e. Ivory Snow, Dreft or Woolite. Never detergent.
Water should be cold to lukewarm. Never more than 100 degrees.
Air dry only. Never apply heat to Sunbrella fabrics."
Note that the liquid "Ivory Snow" is a detergent..so it should not be used.
We shave pieces off of Ivory soap. You can also mix in a dilute solution of chlorox
The 303 for fabric (not vinly) is the best protectorant. 303 also now makes a cleaner for fabric, which is endorsed by Glen Raven Mills for Sunbrella.