I should have taken before and after pictures... this price for a used machine of this caliber, yet there are concerns...This arrived with male beard hairs and animal hair stuck to the screen.  The coarseness implied college senior engineer with poor bathing habits.  I decided to clean it out with an air compressor, and found that the key board was filled to the brim with lint and human hair.  It took a good 30 minutes at 90psi to blast out all the fur.  At this stage i decided to open the bottom.... bad idea.  The amount of organic matter concealed in the main enclosure was vast and plentiful.  I again used the air compressor to de-hair the internals.  The one time a vivid mask may have been useful,  and I'm fresh out of stock... A dousing of alcohol and some windex later,  the machine is clean and functions like new. 👍