Paint is expensive so one of my favorite ways to get the most out of each tube is to use a tube wringer pictured above. There are plastic ones and metal ones available on the market. I prefer the metal one because it can stand up to the job of squeezing the life out of a spent tube of paint; even one with pigments as thick as stack lead white. I've had the one above for many years and it works and looks just as good, minus the small bits of paint, as the day I purchased the tube wringer.
Tube Wringer: Available from Blick Art Supplies