If you’ve been using the same pillow for more than two years, it’s old. Shocking, we know, but according to the National Sleep Foundation, we should be replacing our pillows every one to two years. (This has less to do with your pillow losing support and more to do with all the gross things that seep into it over the course of so many sweaty nights, but we’ll discuss that later.) So, what’s a gal to do with all those old pillows? If you’re not tossing them, you should clean them first.