We are starting to decorate for the Christmas Holidays
Put them in the oven. I put them on an upper shelf.
Set a timer for just 15 minutes
Remove from the oven.. using a mitt to lift the glass holder. They will be hot.
Cleanup is easy. Carefully gather the foil and dispose of.
I suggest only doing a couple at a time, since you need to wipe them out before the wax starts to harden again.
Please only do this with holders made of heavy glass. Not sure what would happen to your fine crystal..