I think it may depend on the plastic composition. Some types are more porous than others, and may absorb odors.

Found this out while trying to clean plastic barrels for maple sap storage. I think esshup's suggestion, as well as Rainman's, are what I would try first. Easy and inexpensive.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.