Your mattress probably came with a guarantee of ten years or more, However, there is a catch. If your mattress has even the smallest stain, then the guarantee is invalidated. This is one of the many reasons why you need to protect your mattress with a mattress cover.
They are not the best, not by along way, but they do the job.
Safeguard the investment that you have made in your mattress and use a mattress cover, and definitely consider plastic as an appropriate material.
Plastic mattress covers can best be described as cheap and cheerful.
Protect Your Mattress With Plastic Mattress Covers
LATEST UPDATE; 14TH FEBRUARY 2017