Please do not machine wash Sunbrella unless it is the furniture grade. While the web site says it's okay we've found significantly shorter life when machine washing "top" grade Sunbrella. If it's "cushion grade" we've seen no problems with machine washing but ALWAYS use a front loader. The "top" grade or the stuff used for dodgers, bimini's etc. is impregnated with a component that gives it it's waterprrof and stiffness. Machine washing can destroy this. If you need to wash it do it in a kiddy pool with luke warm water and Ivory Snow or Dreft non-detergent laundry soap. Let it soak for a couple of days and the fabric will release the dirt into the bottom of the pool..
You want this - 303 Fabric Guard
NOT THIS - 303 Aerospace Protectant
Glen Raven Mills (Sunbrella) has tested a slew of products including Scotchbrite, and many others, and ONLY recommends 303 Fabric Guard for use on Sunbrella. They do not own or have any stake in 303 the company and Glen Raven makes zero money off this recommendation except to keep customers happy and the Sunbrella product lasting...