I don't know about getting out the dirt inside the sleeve, but for the screen getting scratched - I've had an iPad for about 5 years, and usually take it with me in my work backpack, together with lots of papers and, well, anything that gets in (read: not very tidy), all with just its "smart cover" as protection; and I haven't had any scratching problem. So I wouldn't worry too much about this sleeve.
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