We're not sure about 2002 Crownline models, but our 2008 Crownline has Nautolex upholstery with a PreFixx finish.
For Nautolex upholstery they recommend using either Formula 409 All-Purpose Spray Cleaner or Fantastik Spray Cleaner, and for mildew using X-14 Instant Mildew Stain Remover.
In their care and cleaning guide it states "CAUTION: The use of vinyl 'conditioners' or 'protectants' is not recommended and should be avoided on vinyl upholstery treated with PreFixx protective finish."
For upholstery stains, they recommend first determining the type of stain, then using one of three cleaning methods depending on the severity of the stain. You can get all the details on their web site at:
http://www.omnova.com/products/marineOEMUpholstery/marine.aspx
http://www.omnova.com/products/marineOEMUpholstery/documents/NautolexCleanInstruct.pdf http://www.omnova.com/products/marineOEMUpholstery/documents/NautolexPreCleanInstruct.pdf
Hope this is helpful.
Ed & Naomi Bentley
2008 Crownline 19 SS
Moonstone / Onyx
4.3L Alpha