I am not sold on "steeping" as it is usually done with tea, coffee and other organic plant life. It is a process of extracting essential oils out. What is there to steep in a liquid with PG/VG, L Nicotine and a flavoring, usually alcohol based.
tobacco extractions are done in the making of the juices. Now it may be that flavors need to meld together over a given time frame, but this is not steeping, more like "aging".
As far as a fruit flavor goes, chances are it is alcohol based and leaving the cap off can allow the alcohol to evaporate and in doing so either cause the flavor to drop or increase, increase as in a concentrated flavor would be. Or evaporate taking some of the flavor along with it.
In my experience a liquid that has a perfume like taste never has been remedied, not saying it cannot be just I have never had any luck getting rid of it....I have a bottle that is 18 months old, still has the taste of Eu de Cologne.....ok well... Old Spice but I like to live the high life
