You want those 318 months to be useful and productive. That means, on average, you spend 318 months of your life curled up with your mattress. When was the last time you cleaned your mattress? Have you ever cleaned it? Have you ever even thought about cleaning it? Why Should You Clean Your Mattress? You’ve cleaned over, around, and under your bed-but now it’s time to attack the mattress. In our recent blog posts, we’ve been talking a lot about spring-cleaning.