Well, I have had a vase with a candle in the bottom of it for a long time. I had almost concluded that I was going to have to throw it out. You can't put it on the stove to melt or the microwave. I couldn't light the wick. I had tried chiseling it out nothing. Well I thought I would try one more thing... and it worked.
Take a quart canning jar fill it 3/4 full of water and microwave it till the water is boiling. Then set vase down in it. Five minutes later candle slid right out.
Once in a while I succeed.