Can't really help with the question, but I'll add my 2cents on our experience. We made new cushions last year, using 2" open cell and Sunbrella. What we have experienced is the cushions are far to soft so we are in the process of redoing the bottoms using 11/2 close cell under the 2" open cell. Should make for a comfy cushion.
To the question of Sunbrella being hard to keep clean... I'll agree! We take our covers off and wash them about every 2 to 3 weeks. With that being said our cockpit can be fully enclosed and we keep it that way except for the side curtains up when it's warm. Which does helps in keeping the cushion clean. I guess we feel Sunbrella is more comfortable and just looks better so we are willing to put up with the extra effort to keep them clean.
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