To keep your boat cover looking great much longer, make sure to support your cover using boat cover support poles. Supporting your cover properly will prevent water from pooling on the cover. When trailering (or even just for storage), use a tie down kit to prevent damage to your cover.
Never wash your boat cover in a machine. You can use a hose and a soft bristle brush for cleaning. Allow the cover to dry completely before folding for storage.
For more stubborn spots on your Carver boat cover, you can use the following:
Mix ingredients in a bucket or in a spray bottle. Apply to the spot of concern and leave on for 10 minutes. Rinse--allow to dry thoroughly before folding.
For more stubborn spots on your Westland cover, you can clean the cover with a soft bristled brush and a mild detergent such as Dove or Dreft.