While you were sleeping
In a single year...
Your body will produce over 5 gallons of sweat, 1/2 lb. of dead skin and 1/4 cup of skin oil, while you are sleeping.
Some of that ends up in your mattress where it is trapped forever. Unless you know how to somehow shrink your mattress down to a size that will fit in your washing machine, there really are not many good ways to get your mattress clean without voiding your warranty.
Protect your mattress from all of that funk, with a waterproof, mattress protector that will prevent allergens, dust mites and even bed bugs from making their home in your bed.
Improve your sleep and protect your bed for less than the price of a pillow.