Shake vigorously, take the cap off and leave in a safe, cool, dark place for 24 hours, will release the "perfumeyness" I'm told. It has worked with the liquids that were perfumey when I tried them out of the mailbox. Warm water halfway up the bottle with the lid off, can also help evict the perfumeyness. When the water cools to room temp, cap the bottle up, shake it real good, and put it aside in a dark cool place to wait on your next interest. Both these methods are said to accelerate steeping, by those who ought to know, as they have more experience than me with them.
I tend to shake them every few days until I can't stand waiting any more, and drip vape them to test the progress. Lather, rinse, repeat. Then again, I have a fairly large collection of tasty liquids now, so I can afford to say "that one needs to sit in the closet longer" without worrying about running out of liquid steeped to my taste.
The liquids I know I am gonna love, that I buy 50 ml or bigger, I don't open at all; I shake them along with the rest of the steepers when it is shake'in time, and tuck them in the back of the closet in betwen, for some time a few months down the road when my current supply is depleted.
Robart makes a cute little hobby paint/nail polish shaker. I bought a battery powered one off ebay for around 35 bucks w/shipping.
Unless I'm DIY, I don't bother with it much, but running a bottle for 10 minutes after a good hand shaking seems to aerate the liquid pretty well. You can see the little air bubbles hanging there in the mixture.
To Burp or Not To Burp? If you are patient, you can burp the air in the bottle out by squeezing it (or just open up glass bottles to do an oxygen exchange). Beware oversqueezing, unless you are really into a big mess. I burp when the liquid comes out of the shipping container, then when I shake every few days, if it is highly aromatic; putting fresh air in the bottle seems to help steeping a bit.
Whether or not you take caps off or not, I highly recommend checking them to make sure they are on properly before shaking...
The longest I think I have let a liquid steep so far is 3 months or so; didn't lose any flavor, and in most cases, vastly improved it.
YMMV! Happy steeping! And much happy vaping!!!
