I kept my smart cover pretty clean for weeks. Just thought Id get the word out that rubbing your smart cover up against a news paper is a good way to get smudges all over it. For me I didnt know what happened. I came back from lunch one day with marks all over my cover. Even the cover buddy had a little bit of marks here and there. I couldnt figure it out. I cleaned it up and later it happened again and then I noticed it was the Frys Electronics ads that I was carrying around with my ipad. Otherwise, the normal day to day carrying the ipad with covers was no issue as far as marks. Covers are a ink magnet.