Have you ever vacuumed your mattress? I have and did the other day. You would be surprised at how much dust gets sucked out. I have a Dyson cordless vacuum that has a clear collection tank and you can actually see everything that is coming out of what you are vacuuming. YUCK!!
Anyways, just do it. You know you need to change your sheets anyways. Get it vacuumed while they are washing!!! You’ll get 7 points!!!