A garlic press is a kitchen utensil to crush garlic cloves efficiently by forcing them through a grid of small holes, usually with some type of piston. Many garlic presses also have a device with a matching grid of blunt pins to clean out the holes.
There are a few different ways of removing caffeine, but often a solvent will be used to extract caffeine from the coffee bean while leaving all the other chemicals in tact. This is then repeated several times to extract even more caffeine. Other methods involve soaking of the beans to remove caffeine, and subsequently filtering the caffeine out of the water while keeping the beans and extracted coffee solids together.