It always comes back down to bleach, I think. I looked for a non-bleach alternative and did'nt find one years ago. �This link is good and explaining mildew and it's prevention:
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http://extension.missouri.edu/xplor/hesguide/housing/gh5928.htm
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The cure is to keep the interior of the Wesfalia dry, low humidity . I use Dri-Z-Air caclium chloride granules inside the Westfalia to absorb moisture from the air . Dri-z-Air is available at RV supply stores. 
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Robert
1982 Westfalia
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--- On Thu, 4/23/09, Zoltan <thewestyman@GMAIL.COM> wrote:

From: Zoltan <thewestyman@GMAIL.COM>
Subject: Mold on canvas, what to use to clean
To: vanagon@GERRY.VANAGON.COM
Date: Thursday, April 23, 2009, 10:20 PM

Hi all,
I don't remember if we ever nailed down what is the best method to clean off the mold from the canvas, or from the ceiling for that matter.� I am looking for something that is not a caustic as the Chlorox.� I think, the fabric of the canvas would be compromised, weakened with the Chlorox method.� There must be a better way.
Thanks for any help,
Zoltan