Here are the recent answer to this question.
What worked for me was using Clorox SoftScrub. I rubbed it on with rubber gloved hands and let it sit a few minutes, then rinsed off with hose, worked quite well.
By Glenn Bridges08/04/2009
Do not put clorine bleach on a fiberglass boat! It will promote oxidation and dull the finish in a hurry! There are mildew removal products that are safe for humans and the environment and are available at the boat yard or West Marine or Overtons for just a few bucks. The products will remove the stain and will protect the finish on the vinyl and the gelcoat of the boat. Scrubbing with a Mr. Clean Magic Sponge does a really good job on mold removal from hard surfaces and leather and vinyl cleaner and conditioner will normally remove the stains from the seats.
By (Guest Post)06/22/2008
Never oil vinyls because oil will make the vinyl hard. For proper cleaning, sprinkle baking soda or vinegar on rough damp cloth. then, wash with a very mild dish washing soap.
Mildew dry in the sun after moistening with lemon juice and salt. Treat by adding 1/2 cup of liquid lysol to the wash water. On leather, sponge with equal amounts of water and rubbing alcohol.
By Mike (Guest Post)04/26/2008
There is a great environmentally safe cleaner that removes mold and mildew from wood, plastic, composite, cloth, vinyl, aluminum, brick and more. You can see info at www.reliablerep.com
By patti r04/19/2008
Odoban, kills odors, germicide, mold, mildew and is sold in Sam's product has a strong Pine Sol smell.
Concrobium kills mold and mildew sold at Home Depot product has almost no smell
Good Luck Patti
Bleach works but so does a product called Oxyclean. We buy it at Costco.
By .deanj (Guest Post)04/15/2008
Mold can usually be killed with a mixture of bleach and water. One part bleach to 3 parts water. If needed a stronger solution up the bleach and reduce the water. Spray a small amount on the mold to see if the mold is killed. Be aware bleach on metal such as copper and brass can be etched into the metal and will discolor it. Rinse with water as soon as the mold is dead.
By rod (Guest Post)04/15/2008
Get a spray bottle and put a bleach mixture in it.
Add your voice to the conversation. Click here to answer this question.