I live in FL and had a 98 3.8 CVT with a White Top.God that was that a disaster!
I tried "everything" trying to get "Black" mold off of it and nothing worked(white shoe polish nor Bleach was'nt a good idea either).
So I just went and traded it for a 2000 GT CVT(Black,Black,Black)anf founturely now I have a garage to keep her in.
If you can't get a good answer here,I suggest contacting a canvass maker company.They should know what will remove fungus and black stains(now with a black top,no worry about black fungus).

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2000 GT,CVT,Auto,K&N Air Filter,Air Silencer Removed,Slack taken out of the accelerator pedal.16" Metra Antenna.8 months left on Factory Warranty. Hmmmm,then What?
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New Owner of:
http://groups.yahoo.com/group/Mustan...?yguid=6339915
(Plenty of Mustang "link's")