I have 3 sets of basket testers. With the Fall/Winter transition, I needed to update them. But I didn't want to go to the expense of buying new containers (I get my containers and labels from http://www.samplecontainerstore.com/. They have been great to work with.) So I decided to see if I could update using my existing containers. I found that I could, and I found an easy way to do it.
First, I sorted out the outdated basket testers. I discovered the wax would pop right out with a knife. I popped it out and put it in little bags, using the labels from the basket testers, to use for samples and gifts.
Most of the containers came pretty clean after a good swish in hot, sudsy water. (A few stained a little, mainly scents that were red or orange. I decided to use these for like-colored new scents.)
Then I put the new Fall/Winter party testers into my crockpot to soften them (did this in groups of about seven). (Later, I also tried putting them in the oven at about 150, and this worked too.)
I used the small side of a mellon baller to scoop out a ball of wax and put it in the little containers.
Then I closed them up, and put them back in the crockpot.
They melted really quickly, and then I took them out and put the labels on them. (In retrospect: it would have made better sense to put the labels on first, before putting the wax in.) They also set up really quickly once they were out of the crockpot.
This was a really fast, easy, cheap way to update my 3 sets of party containers. It worked great!