Mattmac,
The canopy on my Perentie has mildew marks inside and out; not terrible but there.
I recently took it to a canvas goods manufacturer to do a repair to the torn tube/sock section above the windscreen on one corner. On pickup the canvas repairer recommended cleaning the canvas surface with a 5:1 water/bleach mix followed by a wash with clean water to remove the bleach residual.
I'm progressively working my way front to back, lightly scrubbing with the water/bleach mix first, washing with a woolwash/water mix second, and lastly rinsing with clean water. Got to say results aren't startling; I suspect to a degree once mildew stain is there it is there for good, however it has lightened up some and the mildew is killed in the process.
When washing with the water/bleach mix the mix in the bucket gets cloudy really quickly due to what I assume is the oxidised camo paint as I was told the camo pattern is a coating rather than impregnated in the canvas. So I'm not just continually throwing the milky mix back onto the canvas I make up clean mixes regularly - consequently I go through a heap of bleach.
When I'm done inside and out I plan on waterproofing the external surface with Joseph Lyddy Dry-Seal. Supposed to be the bees-knees according to the canvas guy, and as it is petroleum based I believe it resists the establishment of new mildew, and stops dry-rot.
Good luck!
Dave


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