I have 2 Dell 962 all in one printers.  They are in a room with cig. smoke.  They both print fine with no streaks.  But if you try to make a copy or try to scan anything, they come out with yellow streaks.  I think the "inside" of the printer needs to be cleaned.  How are you suppose to clean the inside of the glass or the inside of these printers?  Anybody got any suggestions.  I really need to do something here.  I can't even make a decent copy of anything without yellow streaks all over the paper and lets not even talk about scanning anything, it's worse.