I have done this for years. Ladies when your mascara is getting low, fill a small glass (enough to cover mascara tube up to the lid, where it screw’s on) fill glass with hot water. Put the Mascara tube into it and let stand a short time I do my other make up as it is working. You would be amazed how much is left in there, I have used a old one for over a month and even longer using it before or after my reg new one till there is just no more left in the old tube. ya save a lot of $ doing this and takes no time at all.