wrote in message

can you recommend a good waterline stain remover? I used a product
called clean-ahoy in england, but its not available in Canada

Depends what the stain is. If it's just algal, try one of the acid
cleaners, such as Zing. If it's petroleum, try acetone. (This assumes
you're talking about stains on fiberglass gel coat. Paints, such as Awlgrip
or Imron have different requirements.)

Max