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I have never seen a treatment for wood that does anything except ruin the grain.
See these in our Project Albums section:
http://www.whalercentral.com/userphot...lbum_id=10
http://www.whalercentral.com/userphot...lbum_id=12
http://www.whalercentral.com/userphot...album_id=1

Don't waste your time with cleaners or treatments.
Sand down and then refinish.

As far as cushions, also see our "OEM parts info and photos" link on the front page.
Take some time and look around this site for all the information you seek:
http://www.whalercentral.com/photogal...hoto_id=44