Yeah...I feel stupid.
Why don't we all bake our juices or microwave it then?
One of my all time favorite internet pictures right there!!!
Microwaving might be a bit on the hot side for
juice: too high a temperature will degrade certain flavor compounds, especially more delicate ketones like in fruit which are the ones that can really make or break a
juice.
There are, however, people on ECF that put
juice into a heated ultrasonic bath (the kind sold for cleaning jewelry or tools). Put the bottle in a bag then pop the bag in the bath. Warmth and all the shaking about for an hour gives a good "quick steep".
EDIT TO ADD:
Something you COULD try (experiments!) is steeping some of your bottles on a heating pad. You might need to shake it several times a day to distribute everything, but I bet it would make a difference.