On Safari coaches with a back to front bed, (not side to side), LOSS OF THE SEAL BETWEEN THE REAR WALL AND THE REAR CAP allows diesel exhaust into the cap and up into the 'attic space' above the ceiling.
Because of the natural negative air pressure, (vacuum), created in the cabin of a moving vehicle, that exhaust then filters down through the Ozite ceiling fabric, leaving black/sooty deposits.
See also https://www.reddit.com/r/askscience/com ... g_car_get/
Black (sooty) stains on/in Ozite ceiling fabric
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Black (sooty) stains on/in Ozite ceiling fabric
Mel
'96 Sahara 3530, mine since '01
250 hp 3126 Cat, MD3060 Allison
'96 Sahara 3530, mine since '01
250 hp 3126 Cat, MD3060 Allison