Not being OCD, just curious as i have a silver iPad and have had a few color variations since they came out, I was curious how strong the aluminum finish is, for instance I got a new iPP and the back came with some of marks (not scratches just strange marks like it had tape on it for moths then removed,) I used one of those Black Zagg microfiber cloths with water to clean it the best I could, (rubbing it quite a lot, but one mark is there ever so slightly.) Is the aluminum strong enough for me to have rubbed it a bit to remove the strange manufacturing marks? Just curious if I need to worry about wearing off the silver color, and if I should only use those fluffy microfiber cloths when cleaning the iPad. Danke. Kallum.