arknoah

Actually, some of these things, like the rust on the outside screws, I believe can be a problem with any unit.  I am not particularly meticulous about cleaning, but since I like my home to be clean, I take care of the unit the same way.  We clean the carpet (yes, we should have ordered the tile floor throughout-- who knew?)  daily, and scrub the floor as well.  In all honesty, I don't expect even a reasonably cared for unit to show lots of mildew and filth unless the owners maintained then that way.  If that is what you are finding now, steer clear of them until you find a good one.