Hey guys, As seems standard with the Speedmaster Pro plastic crystal I have noticed some scuff marks and light scratches being picked up with daily wear. Is there a preferred method and product used to clean up the crystal? I have heard of all sorts of products from polywatch to brasso to even toothpaste. I would be interested in hearing from some of you experts out there on preferred product and method. Bear in mind I am just talking about a light hand cleaning. Thanks!