"Real Name" wrote in message
...
Fantastic is a great cleaner for vinyl, and is recommended by many boat
builders. Bleach will degrade vinyl and the stitching thread.

Bleach will degrade fiberglass, but if it is only used once a year you
will probably not notice it.

http://www.newton.dep.anl.gov/askasc.../chem00615.htm



According to your link bleach will only degrade fiberglass with long term
exposure, meaning leaving the bleach sit on the fiberglass for a long time
without rinsing.

According to your link "Short contact and thorough rinsing should not cause
damage..".

I take that to mean that even if you were to use bleach on the boat every
week, but did not leave it sitting long and flushed it with water thoroughly
there would be no harm to the fiberglass.

Myth busted IMO.