Check the http://type2.com/ archives.  I know this came up sometime in the past couple years.  
Mike
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Date:    Tue, 17 Jan 2006 10:45:44 -0800
From:    chris jackson <chriscjack@BIGPLANET.COM>
Subject: mold in the pop top

I remember this being discus a while ago I thought I had save them but they are gone.
A friend with a 79 westy has it bad & it's  time to sell the bus, he needs to clean it up.
Any help or where to find in the archives?

Thank you,

Chris
82 westy d
sf bay area