Metal Wax I Am Looking To Remove Candle Wax From A Glass And Metal Candle Holder. Tried The Freezer And It Didn't Work.

I am looking to remove candle wax from a glass and metal candle holder. Tried the freezer and it didn't work. - metal wax

I do not want to the metal again with a knife on the outside and the holes for the candles are too small to hold a knife Tried wooden chopsticks, but not strong enough. I can not in the microwave, because the metal. Any other suggestions?