[1] https://en.wikipedia.org/wiki/Butyric_acid
[2] https://en.wikipedia.org/wiki/Cellulose_acetate
I guess it's used where clear or somewhat- clear plastic is used. But does BPA have the same smell over time?
https://en.wikipedia.org/wiki/Hershey_bar
my shitty screwdrivers have the smell you're talking about.
[1] https://en.wikipedia.org/wiki/Butyric_acid
[2] https://en.wikipedia.org/wiki/Cellulose_acetate