[zepsamsung]

Because that plastic polish is for lenses and is a scratch remover also.
It will not protect the chrome or rubber from grime and dirt as well as a good spray teflon or nano wax will. You could use plexus if you want, it cost way more and will not work as well. I will post pics as soon as I can.
My Dad uses plexus to clean His welding mask for work and His motorcycle shield, works great, cost more and will not work as well on your CHROME, PLASTIC, AND RUBBER PHONE.