Whats your method?
Just boil them. I had clear "hard plastic" bottles from Seduce juice that melted, but all the other ones were fine. I just let it come to a boil, and turn the heat down to mediumish for about 15mins. Then let it soak off heat til the water cools enough to drain it into a strainer without worrying about breaking the glass bottles. Then I let them cool enough to the touch to empty them.
This takes out all the scent of the previous flavors?
You just boil or what?
I'd be concerned about melting the plastic...
Just boil them. I had clear "hard plastic" bottles from Seduce juice that melted, but all the other ones were fine. I just let it come to a boil, and turn the heat down to mediumish for about 15mins. Then let it soak off heat til the water cools enough to drain it into a strainer without worrying about breaking the glass bottles. Then I let them cool enough to the touch to empty them.