You can actually reuse your fake eye lashes provided that you maintain them and keep them clean at all times. After removing them carefully, soak them in a tiny amount of warm, soapy water to remove the glue, dust particles, as well as false eyelash mascara that you possibly applied. Use tweezers to pull off glue particles. You can also soak them in your eyelash remover solution instead of soapy water. You can use a moustache brush or some other gentle brush for cleaning between those lashes. Afterwards, dry them and store them back in their original container.
If you take care of it properly, you can reuse it many times. :)