Need A Tip Before Installing My Screen Protector

Just have a quick question.

I've been able to clear my iPhone so that the front look brand new and also the back. However, the Apple logo on the back still has some blemishes to it. It's not scratched or damaged at all but I just can't seem to get it clean. I wanted to ask you guys for some tips before using anything to clean it.

Any advice would be greatly appreciated.

Also, I got a SGP crystal clear and I like it, however it doesn't seem to provide as much coverage as a BSE screen protector. Does anyone know which screen protector offers the most coverage?