The post shave is equally important, maybe even more important than the pre and actual shave itself. If you think that you still have some in-growns, you can actually physically lift the in-grown hair out with a pair of tweezers, but just be careful not to pull it out completely. It will make the hair regrow deeper. Use cold water or a cold towel over your face to cool the skin and close the pores. You can also use some spray toner to bring your pH level of your skin back to normal since some sink water may put your pH out of whack. And of course, a proper aftershave is the best way to end a shave.