The East Germans beat BMW to it - the Trabant's body was made out of a cotton-based plastic that resisted rain, snow, and sun...but apparently not goats, who allegedly liked to munch on the Trabi's body paneling. :-)
Biggest hazard for the BMW...
Moths.
When I lived in Poland, my friend told me that I could buy a Trabi for 2 bottles of vodka...I shoulda tried it...