I used to have the kindest neighbor who I would visit often. She always had everything decorated so nicely, and she always had candles burning. She told me that she always put a little bit of water in the bottom of the glass votive before putting her candle in to prevent the wax from sticking to glass votive and she was right!
Source: My older kind neighbor
This is also a good idea for fire prevention by keeping a glass candle holder from possibly breaking and spreading fire when the candle burns down to the bottom. ;-)
I do this all the time, works great.
This is a great tip! Thank you! Usually, after the candle has burnt down, I soak the votive in very hot and soapy water for about 5 minutes and the remaining wax residue slides right out!
I thank you, Beth, and everyone who as "enlightened" this wonderful tip.
If you're going to put a candle in a glass holder, put a few drops of water down into the glass before you burn it. When the candle melts it won't stick to the glass, and will be easy to remove.