I live is SouthWest Florida where mold is a major issue. Is there any way to treat them so they don't continue to get mold growing on them. It's costing a fortune to continuously replace them.

The furniture is wicker with fabric cushions.

cushions? The cushion covers are of a removeable heavy weight cotton fabric over a foam type material covered in batting. The furniture is kept in a covered, screened in area which does get damp when it rains. I have removed the covers and have washed them with detergent and bleach but after a couple of weeks the mold and mildew return. I was wondering if there was a product out there that can be sprayed on like a scotch-guard type product which will prevent and/or protect the cushions from the mold and mildew?

The fabric is a print so I can not use any bleach/produts that contain bleach.