Just another Moderator
Join Date: Sep 2005
Location: New Westminster, BC
Thanked 490 Times in 464 Posts
Rep Power: 10
IIRC the manufacturer recommends 303 Fabric Guard (also a 3m product, if I'm not mistaken)
Washing sunbrella in strong detergent breaks it down so regular trips through the washing machine are not recommended unless you are using Woolite as opposed to a true detergent.
Water will eventually wick through if the detergent-washed fabric is not treated afterwards.